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Eng light is on suspect pre cat sensor how do I view codes

How do I view codes

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You mean other than getting it hooked up to a diagnostic machine?

Posted on Oct 26, 2012

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Check engine light was on. OBD II scan said both

The pre cat sensors running lean does not mean they need to be replaced. They are are detecting a symptom. You need to know why.

If you are using a basic scantool (code only) you need to look up the P0000 code.
I thought this an odd code. I looked it up in my Autotap unit and it does not exist. The lowest # P (powertrain) code I have listed is P0016.

A regular scan tool, won't scan transmission or body codes, mu Auto tap doesn't either. You need a Tech 2 from the dealer for transmission codes.

First some history. The first O2 sensor was introduced in 1976 on a Volvo. California vehicles got them next in 1980, then federal emission laws made O2 sensors virtually mandatory on all cars and light trucks built since 1981. And now that OBD-II regulations are here (1996 and newer vehicles), most vehicles now have multiple O2 sensors, some as many as four!
The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust. The signal from the O2 sensor tells the computer if the fuel mixture is burning rich (less oxygen) or lean (more oxygen).
A lot of factors affect the richness or leanness of the fuel mixture, including air temperature, engine coolant temperature, barometric pressure, throttle position, air flow and engine load. Other sensors monitor these factors too, but the O2 sensor is the master monitor for what's happening with the fuel mixture. Problems with the O2 sensor can throw the whole system out of whack.
The computer uses the oxygen sensor's input to fine tune the fuel mixture for the best balance of power, economy and emissions. The engineering term for this type of operation is "closed loop" because the computer is using the O2 sensor's input to adjust the fuel mixture. The result is a constant flip-flop back and forth from rich to lean which helps the catalytic converter operate at its best and keeps the average fuel mixture in proper balance to minimize emissions. It's a complicated setup but it works.
If no signal is received from the O2 sensor, like when a cold engine is first started (more on that in a minute) or the 02 sensor fails, the computer orders a steady, rich fuel mixture. This is referred to as "open loop" operation because no input is used from the O2 sensor to fine tune the fuel mixture. If the engine fails to go into closed loop when the O2 sensor reaches operating temperature, or drops out of closed loop because the O2 sensor's signal is lost, the engine will run too rich causing an increase in fuel consumption and emissions. As you might have guessed, that will set a code and turn on your check engine light.
How does it work? The O2 sensor produces a voltage once it gets hot. The sensor compares how much oxygen is in the exhaust to the oxygen in outside air. The greater the difference, the higher the voltage reading.
If you ever replace an O2 sensor (and if you're a DIY'er this is something you will do eventually), its important to remember that the O2 sensor needs to "breath" outside air to work. So don't put any grease on the sensor because it could block this air flow.
An oxygen sensor will typically generate up to about 0.9 volts when the fuel mixture is rich and there is little unburned oxygen left in the exhaust. When the mixture is lean, the sensor's output voltage will drop down to about 0.1 volts. When the air/fuel mixture is balanced or at the equilibrium point of about 14.7 to 1, the sensor will read around 0.45 volts.
When the computer reads a rich signal from the O2 sensor it leans the fuel mixture to reduce the sensor's reading. When the O2 sensor reading goes lean the computer reverses again making the fuel mixture go rich. This constant flip-flopping back and forth of the fuel mixture occurs anywhere from 2 to 7 times a second at 2500 rpm on OBDII vehicles, depending on what type of fuel injection system they have.
The oxygen sensor must be hot (about 600 degrees or higher) before it will start to generate a voltage signal. Many oxygen sensors have a small heating element inside to help them reach operating temperature more quickly.
Ok – that was a lot of info on what they do and how they work. The next thing to know is that trouble codes relating to O2 sensors are very common. But you really need investigate further before replacing an O2 sensor just because you got that trouble code. Armed with the information above on how often the O2 sensor "flips" back and forth and AutoTap or another scantool that allows you to monitor O2 sensor voltage, you can be certain whether the O2 sensor itself is really the problem. These sensors can be pricey, so don't just replace them the first time you see that trouble code!

The O2 sensors are expensive, diagnose what really is going on.

Posted on Aug 24, 2009

  • 2841 Answers

SOURCE: keep getting code po420


Before Checking a Catalytic
Converter DTC
Before you troubleshoot an OBD II vehicle that stores
DTC P0420 (67) (catalyst system efficiency below
threshold), run these quick checks:
1. Check for a leak in the exhaust system. If you find
one, repair it, clear the DTC, and test-drive the
vehicle.
• If the DTC returns, go to step 2.
2. Connect the PGM Tester, and test-drive the vehicle
while an assistant monitors the voltage signal from
the secondary oxygen sensor (HO2S S2). After the
catalyst reaches operating temperature, the HO2S S2
voltage should stay between 0.5 and 0.8 V at steady
cruising speed. During deceleration, the voltage
should be steady at 0.1 V or less.
• If the voltage readings are OK, clear the DTC.
• At cruising speed, if the voltage fluctuates or stays
below 5 V, go to step 3.
3. Measure the inlet and outlet external temperatures of
the catalytic converter with a thermometer capable
of reading up to 500°F.
• If the outlet temperature is more than 100°F hotter
than the inlet temperature, the converter is OK.
• If the outlet temperature is less than 100°F hotter
than the inlet temperature, replace the converter.

Posted on Aug 28, 2009

  • 133 Answers

SOURCE: where is the air mass sensor(air fuel sensor) on

THE AIR FLOW METER IS LOCATED BESIDE THE AIR FILTER HOUSING.
IF YOU ARE GET IT A CHECK ENGINE LIGHT FOR RICH OR LEAN FUEL MIXTURE THE AIR FLOW METER IS THE MOST LIKLY AT FAULT.
AIR /FUEL RATIO SENSORS ARE THE SENSORS BEFORE THE CAT IN MOST NEWER CARS
I DON'T THINK THAT YEAR USES A TRUE A/F SENSOR BUT RATHER A O2 SENSOR.

Posted on Sep 02, 2009

  • 708 Answers

SOURCE: 2oo0 chevy blazer cel and code p0171 and p0174

Depending on the engine it will have between 4 and 2.

If you had a straight 4 or 6 engine then there would be only 2, one on the exhaust manifold or exhaust pipe and then one just after the catalytic converter.

If you have a "V" engine (V8, V6) then you have an oxygen sensor on each exhaust manifold and will have a catalytic converter for each bank of the V. There will also be an oxygen sensor downstream of each converter as well. In this case there would be 4 oxygen sensors.

Posted on Oct 05, 2009

wracefans24
  • 1985 Answers

SOURCE: P2096 Engine Code for a 2005 Caravan

P2096=Post Catalyst Fuel Trim System Too Lean Bank 1,
drivers side was too lean at one time and set code,You should hhave the code erased and see if it returns again,

Posted on Dec 29, 2009

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I have 99 bmw 323i.i ran it hot and got prob fixed and now the eml and a triangle with circle around it comes on dash and car has no power.feels like it has a rev limiter.wats wrong with my car


have throttle body checked also the MDK throttle motor,
make sure that the dealer has followed service bulletin 12 07 99 for procedure to replace the MDK throttle motor
also have them check for codes,here are some codes,
it could be an expensive job,have them check everything,it is most likely the throttle motor,,throttle body is 600 if they switch it,dont let them do it without checking throttle motor,
codes,
MS41, MS42 and MS43 engine DME bmw codes...
• 1 Ignition coil Cyl 2
• 2 Ignition coil Cyl 4
• 3 Ignition coil Cyl 6
• 5 Fuel injector Cyl 2
• 6 Fuel injector Cyl 1
• 8 Air Flow Meter (HFM)
• 10 Coolant Temperature Sensor
• 11 Tank Pressure Sensor (EVAP System) or Radiator Outlet Temp (MS43)
• 12 TPS or Plausibility - Maximum Coolant Temp (MS43)
• 13 Plausibility- Radiator Outlet Temp
• 14 Intake Air Temperature Sensor
• 15 Plausibility - Cut Out Time
• 16 AirCon Compressor - PWM Signal or Plausibility Intake Air Temp (MS43)
• 17 Plausibility - Engine Coolant Temp
• 18 EWS Signal or Camshaft Sensor (MS43)
• 19 Activation VANOS Inlet Valve or Exhaust Valve (MS43)
• 20 "CHECK ENGINE" Light Failure
• 21 VANOS -Electrical Fault or Activation VANOS Inlet Valve (MS43)
• 22 Fuel Injector Cyl 3
• 23 Fuel Injector Cyl 6
• 24 Fuel Injector Cyl 4
• 25 Lambda Sensor Heater -Bank 1
• 27 Idle Control Valve - Malfunction
• 29 Ignition Coil Cyl 1
• 30 Ignition Coil Cyl 3
• 31 Ignition Coil Cyl 5
• 33 Fuel Injector Cyl 5
• 35 Aux. Air Injection System Relay
• 36 DME Main Relay
• 37 DME Main Relay : Delay
• 38 Clutch Switch -Plausibility
• 39 Brake Light Switch or Brake Light Test Switch
• 40 Brake Light Switch or Pedal Value Signal
• 42 Multi Function Steering Wheel- Plausibility
• 43 Multi Function Steering Wheel: Button
• 45 Multi Function Steering Wheel: Port
• 47 Temp Sensor -Downstream of Pre-Cat or Torque Limitation Level 1 (MS43)
• 48 DME Control Unit -Self Test 1
• 49 DME Control Unit or Torque Monitoring Level 2 (MS43)
• 50 EVAP Control Valve or Response Monitoring Level 2 (MS43)
• 51 Shut-off Valve -Charcoal Filter or Request Control Unit Reset (MS43)
• 52 Solenoid Valve -Exhaust Flap
• 53 Idle Speed Actuator
• 55 Lambda Sensor Heater -Bank 2
• 56 Ignition Current Feedback Resistor - Open Circuit
• 57 Knock sensor -Bank 1
• 58 DME Control Unit -Self Test 2
• 59 Knock Sensor -Bank 2
• 61 Lambda Sensor Heater -Bank 2 Post Cat
• 62 Aux. Air Injection System -Switching Valve
• 63 DME Control Unit or Ambient Temp Signal via CAN (MS43)
• 64 Plausibility - Ambient Temperature
• 65 Camshaft Position Sensor (Inlet MS43)
• 66 DME Control Unit
• 67 DME Control Unit
• 68 Tank Venting Valve
• 69 Fuel Pump Relay
• 70 DME Control Unit
• 71 DME Control Unit
• 72 DME Control Unit
• 74 AirCon Compressor Relay
• 75 Lambda Sensor Voltage -Bank 1
• 76 Lambda Sensor Voltage -Bank 2
• 77 Lambda Sensor Voltage -Bank 1 Post Cat
• 78 Lambda Sensor Voltage -Bank 2 Post Cat
• 79 Lambda Sensor Heater -Bank 1 Post Cat
• 80 ABS/ASC interface
• 81 MSR Signal -Active too Long
• 82 ABS/ASC Interface -Advance Adjustment
• 83 Crankshaft Sensor
• 90 Exhaust Temperature Pre Cat Conv - Bank 1
• 91 Exhaust Temperature Pre Cat Conv - Bank 2
• 92 Exhaust Temperature Post Cat Conv -Bank 1
• 93 Exhaust Temperature Post Cat Conv -Bank 2
• 94 Auxiliary Air -Air Mass Flow Sensor
• 95 Auxiliary Air Valve or Auxiliary Air Hose Blocked
• 96 Auxiliary Air Pump - Function
• 97 Auxiliary Air -Flow Rate too Low
• 98 Auxiliary Air -Flow Rate too High
• 99 Auxiliary Air Valve Jammed Open
• 100 DME Control Unit -Self-Test Failed
• 103 VANOS Error -Inlet Camshaft
• 104 VANOS Error -Exhaust Camshaft
• 105 VANOS Error -Position Inlet Camshaft
• 106 VANOS Error -Position Exhaust Camshaft
• 109 Throttle Valve Plausibility
• 110 Pedal Sensor Value Potentiometer 1
• 111 Pedal Sensor Value Potentiometer 2
• 112 TPS Potentiometer 1
• 113 TPS Potentiometer 2
• 114 Throttle Valve Final Stage
• 115 Reference Voltage -Voltage Regulator 1 or Throttle Pedal Adaptation (MS43)
• 116 Reference Voltage -Voltage Regulator 2
• 117 Plausibility -Pedal Position Sensor 1/2
• 118 Plausibility -TPS 1/2 or TPS1/Airflow Plausibility (MS43)
• 119 Throttle Valve Sensor -Mechanical Error or TPS2/Airflow Plausibility (MS43)
• 120 Plausibility Pedal Sensor or TPS
• 122 Engine Oil Temperature
• 123 Map Cooling Thermostat Control
• 124 Activation DISA Solenoid
• 125 Activation Electric Fan
• 126 Activation Tank Leak Pump Solenoid
• 127 Activation Pump Solenoid
• 128 DME/EWS Communication
• 129 CAN Signal SMG 1
• 130 CAN Signal ASC -Timeout
• 131 CAN Signal Instrument Cluster -Timeout
• 132 CAN Signal Instrument Cluster -Timeout
• 133 CAN Signal ASC -Timeout
• 134 SMG Intervention -Plausibility
• 135 Throttle Valve Re-Adaptation Required
• 136 Throttle Valve -Spring Test and Limp-home Position Failed
• 137 CAN Signal -Steering Angle Sensor
• 139 CAN Signal -Tank Level Sensor
• 140 Tank Leak Pump Solenoid - Reed Switch Open or Output Stage (MS43)
• 141 Tank Leak Pump Solenoid - Reed Switch Stuck Closed or Tank Level Sensor (MS43)
• 142 Tank Leak Pump Solenoid - Reed Switch Stuck Open or DMTL Module (MS43)
• 143 Tank Ventilation or Tank Leakage (MS43)
• 144 Fuel System - Large Leak Recognised
• 145 Fuel System - Small Leak Recognised
• 146 EVAP System Leak Detected (Small Leak) or Pedal Sensor Supply Voltage Pot 1 (MS43)
• 147 Pedal Position Sensor Potentiometer Supply Channel 1 (Pot 2 MS43)
• 149 Air Flow Sensor or Pedal Value Sensor Mismatch
• 150 Lambda Post Cat Bank 1 Max Limit
• 151 Lambda Post Cat Bank 2 Max Limit
• 152 Lambda Post Cat Bank 1 Min Limit
• 153 Lambda Pre Cat Bank 2 Max Limit
• 154 Lambda Pre Cat Bank 2 Min Limit
• 155 Lambda Pre Cat Bank 2 No Signal
• 156 Lambda Pre Cat Bank 1 No Signal
• 157 Lambda Post Cat Bank 1 Min Limit
• 159 Lambda Post Cat Bank 2 Max Limit
• 160 Lambda Post Cat Bank 2 (MS41) or Throttle Valve Stuck
• 161 Throttle Valve - Stuck
• 162 Throttle Valve -Control Deviation
• 168 Pedal Position Sensor Pot Supply 1 or MAP Cooling Thermostat Jammed (MS43)
• 169 Throttle Valve Output Stage Cut off after Fault
• 170 DME Control Unit -Self Test Failed
• 171 Plausibility - Throttle Valve
• 172 Pedal Sensor Potentiometer 1/2 Short Circuit
• 173 TPS Potentiometer 1/2 Short Circuit
• 174 Throttle Valve Potentiometer 1/2 Adaptation
• 175 Pedal Sensor 1 Adaptation
• 176 Pedal Sensor 2 Adaptation
• 186 Voltage Post Cat Bank 1
• 187 Voltage Post Cat Bank 2
• 188 Voltage Pre Cat Bank 1
• 189 Voltage Pre Cat Bank 2
• 190 EVAP -Reed Switch Open or Voltage Post Cat Bank 1 (MS43)
• 191 EVAP -Reed Switch Closed or Voltage Post Cat Bank 2 (MS43)
• 192 EVAP -Reed Switch Open
• 193 EVAP -Check Hoses
• 194 EVAP -Large Leak Detected
• 195 EVAP -Small Leak Detected
• 196 EVAP -Electrical Valve from LDP Pump or Barometric Pressure Sensor (MS43)
• 197 EVAP -Barometric Pressure Sensor
• 198 Cat Efficiency during Start -Bank 1
• 199 Cat Efficiency during Start -Bank 2
• 200 Lambda Regulation Bank 1 Pre Cat
• 201 Lambda Regulation Bank 2 Pre Cat
• 202 Lambda Regulation Bank 1 Post Cat
• 203 Lambda Regulation Bank 2 Post cat
• 204 Idle Control System -Idle speed not plausible
• 208 EWS -RPM Signal Error
• 209 EWS -Message Error
• 210 Ignition Feedback Resistor (ZSR)
• 211 Idle Speed Actuator -Mechanical
• 212 VANOS Bank 1 -Mechanical
• 214 Vehicle Speed Signal (VSS)
• 215 Lambda Sensor Bank 1 or ASC/MSR/EML -Interface not plausible
• 216 Lambda Sensor Bank 2 or EGS Position Signal
• 217 CAN bus error -EGS Signal not present
• 218 CAN module -Warning
• 219 CAN module -CAN Offline
• 220 Lambda Voltage Range Bank 1 Sensor 1
• 221 Lambda Voltage Range Bank 2 Sensor 1
• 222 Low Coolant Temperature or Lambda Sensor Control (MS43)
• 223 Lambda Sensor Switching Bank 1 Sensor 2
• 224 Lambda Sensor Switching Bank 2 Sensor 2
• 225 Cat Efficiency Bank 1
• 226 Cat Efficiency Bank 2
• 227 Mixture Deviation Bank 1
• 228 Mixture Deviation Bank 2
• 229 Lambda Sensor Switching Bank 1
• 230 Lambda Sensor Switching Bank 2
• 231 Lambda Sensor Switching Bank 1 Pre Cat
• 232 Lambda Sensor Switching Bank 2 Pre Cat
• 233 Catalytic Converter Overall Efficiency Bank 1
• 234 Catalytic Converter Overall Efficiency Bank 2
• 235 Lambda Heater Bank 1 Post Cat or Pre Cat Signal (MS43)
• 236 Lambda Heater Bank 2 Post Cat or Pre Cat Signal (MS43)
• 238 Misfire Cyl 1
• 239 Misfire Cyl 2
• 240 Misfire Cyl 3
• 241 Misfire Cyl 4
• 242 Misfire Cyl 5
• 243 Misfire Cyl 6
• 244 Crankshaft Interval Timing
• 245 Aux Air Injection System Bank 1
• 246 Aux Air Injection System Bank 2
• 247 Aux Air Injection System -Incorrect Flow Detected
• 248 Pre Cat Converter Efficiency -Bank 1
• 249 Pre Cat Converter Efficiency -Bank 2
• 250 Tank Venting Valve -Function
• 251 Tank Ventilation Diagnosis Error
• 252 Tank Ventilation System Vacuum
• 253 Activated Charcoal Filter Shut-off Valve Stuck Shut
• 254 Tank Ventilation System -Large Air Leak
• 255 Tank Ventilation System -Valve Stuck Open

Apr 03, 2015 | 1999 BMW 323i

1 Answer

Error Code P0430


this is the o2 sensor after the pre cat so post cat you can get a tune to get rid of code or replace the o2 sensor or get spacer that screws into the cat witch will make it not code the o2 sensor is there to just make sure the cat is there for emissions and will not effect the gas milage

Jul 15, 2014 | 2004 Audi TT

1 Answer

2005 dodge sprinter p0053 p0130 p0131 p2238 p2245 problems


These can actually have TWO o2 sensors (Lambda)
Normally one pre Cat and on Post Cat (Cat - Catalytic converter)
You will have one on the headers from the engine. then you may also have one after the Cat.

Check if you also have the second, as this may the one at fault.

Apr 03, 2014 | Dodge Sprinter Cars & Trucks

1 Answer

My 2004 optima has 130000 runs little ruff check engine light came on code says running rich like it could be vacumm leak so replace fuel injector regulator did not solve any thing else it could be?


intake leak, bad plugs, pre cat oxygen sensor. take to kia and have them run full diagnostics. Most likely pre cat oxy sensor or bad plugs and wires.

Oct 13, 2013 | 2004 Kia Optima

1 Answer

Bmw code 29a8 power management failure and l cant understand the meaning


BMW outputs codes in Hex format. The tool then reads the code and it may translate it to its own format. Some 29A.. code definitions here:

29A0 Lambda Sensor Post Cat Bank 2 Signal
29A1 Lambda Sensor Post Cat Bank 2 Signal
29A2 Lambda Sensor Pre Cat Bank 2 Signal
29A3 Lambda Sensor Pre Cat Bank 2 Signal
29A4 Lambda Sensor Heater Pre Cat Bank 1 Activation
29A5 Lambda Sensor Heater Pre Cat Bank 2 Activation
29A6 Lambda Sensor Pre Cat Bank 1 Signal
29A7 Lambda Sensor Pre Cat Bank 1 Signal
29A8 Power Management Network Failure
29A9 Power Management Battery
29AB Torque Request via CAN
29AE Tank Cap

Code 29A8 i
t's a NETWORK management fault, related with tne main computer. Will need to visit BMW dealer to delete or reset it.

I hope helps with this.

Mar 18, 2011 | 2009 BMW 5 Series

1 Answer

Code 29a8 power management failure, ldont understand the meaning


BMW outputs codes in Hex format. The tool then reads the code and it may translate it to its own format. Some 29A.. code definitions here:

29A0 Lambda Sensor Post Cat Bank 2 Signal
29A1 Lambda Sensor Post Cat Bank 2 Signal
29A2 Lambda Sensor Pre Cat Bank 2 Signal
29A3 Lambda Sensor Pre Cat Bank 2 Signal
29A4 Lambda Sensor Heater Pre Cat Bank 1 Activation
29A5 Lambda Sensor Heater Pre Cat Bank 2 Activation
29A6 Lambda Sensor Pre Cat Bank 1 Signal
29A7 Lambda Sensor Pre Cat Bank 1 Signal
29A8 Power Management Network Failure
29A9 Power Management Battery
29AB Torque Request via CAN
29AE Tank Cap

Code 29A8 i
t's a NETWORK management fault, related with tne main computer. Will need to visit BMW dealer to delete or reset it.

I hope helps with this.

Mar 17, 2011 | 2009 BMW 5 Series

2 Answers

Check eng light trouble code PO420 bank 1 on toyota camry 2002 le replaced top oxygen sensor reset codes and check eng. light came back on.


More often than not the Cat is bad. Replacing the sensors is the easiest move. Reasons for the cat to go bad will be related to something else wrong with the fuel management and emissions systems in the car, improper sealants or chemicals used on prior repairs causing damage to the cat

Aug 13, 2010 | 2002 Toyota Camry

1 Answer

P1401 code set, was told to replace the front pre cat / manifold assembly did but code still setting.


After replacing the front pre cat/manifold assembly, if a new gasket was used on the flange where the precat mates to the exhaust pipe, make sure the bolts are tight and reset the engine codes with a scanner at a parts store. If the engine light comes on again with the same code you may have a faulty oxygen sensor.

Apr 07, 2010 | 2003 Kia Spectra

1 Answer

Check engine light is on


A code P0420 is a generic code for catalyst inefficiency. It means the computer is comparing the pre cat O2 sensor value with the post cat O2 sensor value. If they are doing the same thing, it means the cat is inoperative.
Here's how it works in a nutshell. The pre cat O2 sensor tells the computer to regulate fuel delivery at an air / fuel ratio of 14.7 :1 so if you measured it's output, it would be toggling back and forth across 0.5 volts trying to maintain this. This is not for maximum power or efficiency. This is strictly to allow the cat to operate in it's best range. This is actually a lean running engine, but the cat needs a little oxygen to catalyze the remaining harmful emissions. When this small amount of oxygen enters the cat, it is supposed to react with the catalyst and emissions and burn completely, hence no oxygen exiting the cat. Since all an oxygen sensor "sees" is oxygen, it is not suppose see any coming out of the cat. Basically, when an O2 sensor sees oxygen it should have an output voltage below .5 volts (really about .1V) When it sees oxygen it should be over .5V, typically about.9V Sooo....the computer wants to see something over .5V all the time if the vehicle is warmed up. Now if you happen to have a cat that is degrading and it can't catalyze completely, some oxygen will exit the cat and drive this voltage down and set a code. Here's the rub, if the engine or the state of tune has degraded, then the cat will have more **** and corruption to deal with than it was designed to handle. So some oxygen will sneak past and set the code as well.
The moral of the story, the engine must be in a perfect state of tune before diagnosing a bad cat. Ignition related parts are always suspect, the aforementioned O2 sensors in the clarification request were likely replaced unnecessarily as they were just doing their job.

Sorry, it was a big nutshell.

Mar 17, 2009 | 1999 Acura TL

1 Answer

Management light Cat problem code


You mentioned a non genuine cat being fitted. That in itself is not too much of a problem, however, non genuine oxygen sensors are. There is a huge difference in quality between the genuine article and cheep alternatives on the after market. I very much suspect your fault code has been tripped by such a replacement part. Exceptionally complex engine management control systems just cant recognise the electronic info thats being sent by non-gen sensors, so its a false economy to fit these. Also one thing to bear in mind for the future is to avoid using super market fuels. Its a common belief that all fuels are the same and it all comes from the same tankers, etc etc. This is absolute rubbish. Its like comparing a 20 year old single malt Scottish Whiskey with a Happy Shopper bargain blend. It may look the same, but there's simply no comparison. Prolonged use of these cheep fuels will produce long term running problems. Also dont forget, there are pre and post catalytic converter oxygen sensors on your car, so the bills can get expensive. Good luck

Jan 16, 2009 | 2005 Audi A3

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