Question about 2002 Mitsubishi Eclipse

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How do you know if you have a faulty rear ho2s sensor and where is it located?

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A rear o2 sensor(s) will be behind....( to the rear ) of the catalytic converter(s) on the exhaust system.
You will most always have a "check engine light" on.
Go and buy a cheap OBD2 code reader at any auto parts store and check the codes yourself.
By law, the plug for the OBD2 terminal has to be with-in 3 feet of the steering column.........just look under the dash area for your post to connect to.
It is just a plug in and read process....very easy.
If you do have a bad rear sensor the code will show on the OBD2 reader.

Posted on Sep 24, 2009

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O2 sensors are located on the exhaust pipes
1-2 before the cataltic converters and 1-2 after the cat. converters. 4 cyl engine has 1 before and 1 after. 6 and 8 have 2 before and after mostly) to determine if they are bad it is best left to a repair facility to run a computer diagnostic test routine and or emissions system tests.

Posted on Sep 23, 2009

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How many o2 sensors on a 99 Cadillac catera


Four .
Heated Oxygen Sensor (HO2S Bank 1 Position 1)
Located in RH front pipe of the exhaust catalytic converter
--
Engine Controls Connector End Views in Engine Controls
Heated Oxygen Sensor (HO2S Bank 1 Position 2)
Located in RH rear pipe of the exhaust catalytic converter
--
Engine Controls Connector End Views in Engine Controls
Heated Oxygen Sensor (HO2S Bank 2 Position 1)
Located in LH front pipe of the exhaust catalytic converter
--
Engine Controls Connector End Views in Engine Controls
Heated Oxygen Sensor (HO2S Bank 2 Position 2)
Located in LH rear pipe of the exhaust catalytic converter

Sep 21, 2015 | Cadillac Cars & Trucks

1 Answer

Codes P2270& P2272 after oil change check engine light on drove under 100 miles both O2 sensors bad .Could shop have caused this somehow??? Maybe banging them or something ?


make sure they are plugged in tight Definition of Diagnostic Trouble Code P2270 Category: Powertrain Definition: O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2Note: This definition of P2270 is applied to all manufacturers

P2270 - O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Comments ' Add Yours
Possible causes
- Faulty Rear Heated Oxygen Sensor Bank 1
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Exhaust gas leaks Help with this
When is the code detected?
The Powertrain Control Module (PCM) detected the HO2S12 sensor has reported a lean condition for an extended period during an intrusive test
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P2270 Description
The Powertrain Control Module (PCM) supplies a voltage of about 450 mV between the HO2S high and low signal circuits. The oxygen sensor varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean.
The PCM monitors and stores the heated oxygen sensor (HO2S) voltage information. The PCMevaluates the HO2S voltage samples in order to determine the amount of time the HO2S voltage was out of range. The PCM compares the stored HO2S voltage samples taken within each sample period and determines if majority of the samples are out of the operating range.

Definition of Diagnostic Trouble Code P2272 Category: Powertrain Definition: O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2Note: This definition of P2272 is applied to all manufacturers

P2272 - O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2
' Add Comment
Possible causes
- Faulty Rear Heated Oxygen Sensor Bank 2
- Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Exhaust gas leaks
What does this mean?
When is the code detected?
The Powertrain Control Module (PCM) detected the HO2S22 sensor has reported a lean condition for an extended period during an intrusive test
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P2272 Description
The Powertrain Control Module (PCM) supplies a voltage of about 450 mV between the HO2S high and low signal circuits. The oxygen sensor varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean.
The PCM monitors and stores the heated oxygen sensor (HO2S) voltage information. The PCMevaluates the HO2S voltage samples in order to determine the amount of time the HO2S voltage was out of range. The PCM compares the stored HO2S voltage samples taken within each sample period and determines if majority of the samples are out of the operating range.
P2272 Information for specific makes
P2272 BMW
P2272 DODGE
P2272 FORD

Jul 30, 2015 | Cars & Trucks

2 Answers

Check engine light is on and i got error code p1133. what is that?


Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
- Vacuum leak
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical connection

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. The PCM determines if the front HO2S is functioning properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.

If the Powertrain Control Module (PCM) determines that the front HO2S did not switch enough times, the PCM will set the P1133 code.

replace the o2 sensor

Dec 14, 2013 | 2006 Saturn Vue 2.2

1 Answer

Two codes


code p1443 - Evap canister purge system mafunction.possible cause faulty Evap canister purge valve.fuel vapor hose blocked between Evap purge valve and the FTP sensor or blocked between purge valve and intake manifold or vacuum hose blocked between purge valve and intake manifold.code po430 catalytic system efficiency bank 2 below threshold.possible causes. air leaks at the exhaust manifold or in the exhaust pipes. catalytic converter is damaged.ECT OR CHT SENSOR has lost its calibration.engine cylinders misfiring or the ignition timing off.engine oil is contaminated.front HO2S or rear HO2S is contaminated with fuel or moisture.both front HO2S OR REAR HO2S is loose in mounted hole. fuel pressure is too high due to faulty fuel pressure regulator.

Jan 02, 2013 | 1996 Ford Thunderbird LX

1 Answer

Engine code po138


Hi there:Likelly needs a down strem o2 sensor...

Circuit Description
The PCM has the ability to monitor this process by using a rear Heated Oxygen Sensor (HO2S 2). The rear HO2S 2, located in the exhaust stream past the catalytic converter, produces an output signal relative to the oxygen storage capacity of the catalytic converter. The PCM then calculates the ability of the catalytic converter to convert the exhaust emissions effectively. Whenever the catalytic converter is functioning properly, the rear HO2S 2 signal will be far less active than the signal produced by the front Oxygen Sensor 1 (O2S 1).


Conditions for Setting the DTC

  • DTCs P0106, P0107, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0200, P0300, P0301, P0302, P0303, P0304, P0404, P0405, P0508, P0507, P1404, P1441 not set.
  • Engine run time is greater than 25 seconds.
  • Engine Coolant Temperature (ECT) is greater than 40 degrees C (104 degrees F).
  • Air/fuel ratio is between 14.5:1 and 14.7:1.
  • Throttle Position (TP) angle is between 5% and 50%.
  • Engine has met the above conditions for 140 seconds.
  • O2S 1 voltage is greater than 1042 mV for 50 to 75 seconds.


Action Taken When the DTC Sets

  • The Malfunction Indicator Lamp (MIL) will illuminate.
  • The PCM will record operating conditions at the time the diagnostic fails. The Freeze Frame and Failure Records buffers will store this information.
  • A history DTC is stored.


Conditions for Clearing the MIL/DTC

  • The MIL will turn off after 3 consecutive ignition cycles in which the diagnostic runs without a fault.
  • A history DTC will clear after 40 consecutive warm up cycles without a fault.
  • A scan tool can clear the DTCs.


Diagnostic Aids
Whenever the oxygen sensor pigtail wiring, connector or terminal are damaged, the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector or terminals. In order for the sensor to function properly, the O2S must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade the performance of the oxygen sensor. Check for the following conditions:

  • A rich exhaust - An overly rich exhaust may load the catalytic converter causing high rear HO2S 2 signal voltages.
  • A silicone contamination - A silicone contamination of the rear HO2S 2 may cause a false rich condition. A powdery white deposit on the rear HO2S 2 will indicate this condition.
  • A faulty HO2S 2 - Whenever the rear HO2S 2 is internally shorted, the rear HO2S 2 voltage displayed on a scan tool will be over 1.0 volt. Disconnect the rear HO2S 2. Jumper the rear HO2S low circuit to the engine ground. Whenever the rear HO2S 2 voltage goes from 100 mV to around 450 mV, replace the rear HO2S 2.
  • An intermittent test - Observe the rear HO2S 2 on a scan tool while moving the related connectors and wiring harness with the key ON. Whenever the fault is induced, the rear HO2S 2 display will change. This may help isolate the location of the malfunction.
  • A damaged harness - Inspect the PCM harness for a short to voltage in the rear HO2S 2 low circuit.


Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.

  1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
  2. This step determines if DTC P0138 is the result of a hard failure or an intermittent condition.
  1. Disconnecting HO2S 2 and jumpering CKTs 1668 and 1669 to ground should cause the scan tool to display HO2S 2 voltage below 100 mV (0.1 V). If the signal voltage is still high, the PCM is malfunctioning.
  1. Replacement PCMs must be reprogrammed. Refer to the latest Techline information for programming procedures.


Hope this helps.

Apr 25, 2012 | 1996 Jeep Grand Cherokee

1 Answer

Code p0131 Excessive fuel consumption Intermittent no start (cranks, fires up then dies) Replaced Plugs and wires Fuel filter 02 sensor I don't know where to go from here


CODE PO131 - HO2S 11 BANK 1 SENSOR SENSOR I CIRCUIT LOW INPUT CONDITIONS. POSSIBLE CAUSES LOOK FOR INTAKE LEAKS IN THE EXHAUST SYSTEM, LOOK FOR INTAKE VACUUM LINES LEAKS. FUEL SYSTEM TOO LEAN WEAK FUEL PRESSURE CLOGGED FUEL FILTER,WEAK FUEL PUMP. FAULTY HO2S SENSOR.OR HO2S SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR. HO2S SENSOR DAMAGED CRACKED OR HOLE CLOGGED. PCM HAS FAILED.

Aug 12, 2011 | Chevrolet Malibu Cars & Trucks

1 Answer

I recieved a code PO139 on my Hyundai Elantra and was wondering what that code details. Thanks


P0139 - HO2S Circuit Slow Response (Bank 1 / Sensor 2)

Possible causes:

Leak in intake or exhaust system
?? Faulty fuel system.
?? Front and rear HO2S connections reversed.
?? Contact resistance in connectors
?? HO2S contamination

Most PROBABLE cause: Defective/Old/Aging O2 sensor

Jun 10, 2011 | Hyundai Elantra Cars & Trucks

2 Answers

HAVE CODE PO420 IN MY CAR NISSAN ALTIMA 2002 2.5


this is a common code on nissans and it is due to the O2S1 sensor reading that the cat is operating below threshold-can be
;
- Three way catalyst converter Bank 2
- Engine Control Module (ECM) Program
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module

most of the time it can be corrected by a nissan dealer, by reprogramming the stringent maps in the ECM, and the put out bulletins saying they would cover it if under 80,000-8 years, so that is not going to work-check the other possible issues then make calls to the dealer and see if you can get them to treat you like a future customer instead of a bother.

Apr 19, 2011 | 2002 Nissan Altima

3 Answers

I received a failed emmision test result and was given a trouble code number P1151.How can I find out what this is


CODE P1151 LACK OF HO2S 21 SWITCHING HO2S SIGNAL LOW INPUT.POSSIBLE CAUSE LOW FUEL PRESSURE.INJECTORS STOPPED UP.FAULTY HO2S SENSOR LOOK FOR INTAKE AND EXHAUST LEAKS.LOOK FOR AIR LEAKS LOCATED AFTER THE MAF SENSOR MOUNTING LOCATION OR IN THE PCV SYSTEM.

Jan 15, 2011 | 1999 Ford Expedition

1 Answer

I need a diagram of the exhaust system on a Mazda 626


0996b43f80203328.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Component Location Chart-2000 MPV

1 PCM 2 Mass air flow (MAF)/intake air temperature (IAT) sensor 3 Throttle position (TP) sensor 4 Fuel tank pressure sensor 5 Engine coolant temperature (ECT) sensor 6 Crankshaft position (CKP) sensor 7 Camshaft position (CMP) sensor 8 Knock sensor 9 Heated oxygen sensor (HO2S) (front, LH) 10 Heated oxygen sensor (HO2S) (front, RH) 11 Heated oxygen sensor (HO2S) (rear, LH) 12 Heated oxygen sensor (HO2S) (rear, RH) 13 EGR boost sensor 14 Power steering pressure (PSP) switch 15 Main relay


0996b43f8020330c.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Component Location Chart-2001 MPV

1 PCM 2 Mass air flow (MAF)/Intake air temperature (IAT) sensor 3 Throttle position (TP) sensor 4 Engine coolant temperature (ECT) sensor 5 Crankshaft position (CKP) sensor 6 Camshaft position (CMP) sensor 7 Knock sensor 8 Heated oxygen sensor (HO2S) (front, LH) 9 Heated oxygen sensor (HO2S) (front, RH) 10 Heated oxygen sensor (HO2S) (rear, LH)* 11 Heated oxygen sensor (HO2S) (rear, RH)* 12 EGR boost sensor


0996b43f8020330f.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Component Location Chart- 2002-06 MPV

May 22, 2010 | 2004 Mazda MPV

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