Question about 2003 Volkswagen GTI

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Code # is P1142 the car failed emission inspection, is it an O2 sensor, or is it the Catalytic converter?

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Sounds like you need to clean the MAF-Mass air flow sensor-needs cleaning. Follow the link below there are some good tips there.
Good Luck







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Posted on Jul 03, 2010

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Why would one bank of my engine be running lean?


If check engine light is on. Get it scanned to find the problem code. They will do this at any auto parts store for free, It may be a bad 02 sensor. Get it scanned. A vehicle can fail a state-mandated smog test because a bad, or faulty, oxygen sensor. remove the O2 sensor from the exhaust pipe ahead of the catalytic converter and look for a change in performance. Good-Day!

Jul 25, 2014 | 2010 Buick LaCrosse CXL

1 Answer

Error code p0183 where is this sesor and what doest hurt


the o2 sensor [bank 1 sensor 2] is located after ur catalytic converter jack up and support truck follow the exhaust pipe u will see after the converter mounted in exhaust tube towards top a wire and sensor thats ur o2 sensor disconnect wire and unscrew sensor and replace -also check wiring and connection for damage ---it is an emission sensor will usually cause vehicle to fail an inspection can cause problems with fuel consumption[run rich]

Aug 23, 2011 | 2004 Hyundai Santa Fe

1 Answer

I changed the battery (May 30th) in my 2007 dakota and now i need an inspection completed. Two systems (Catalyst and O2) have not reset and i have driven 500 miles (highway and city); it is now Jun10th. ...


HAVE GARAGE CODE SCAN VECHICLE.IF YOU ARE GETTING CATALYTIC CONVERTER FAULTS OR OXYGEN SENSOR FAULT CODE.YOU HAVE FAILED SENSORS OR VACUUM LEAKS. SOMETHING IS UPSETTING THE EMISSION CONTROL SYSTEMS.

Jun 10, 2011 | 2007 Dodge Dakota Cab SLT

3 Answers

My check engine light came on and I took the car to the auto parts store and they diagnosed it as the catalytic converter. I stopped driving it for a few months took. Then I took the car for an...


What was the exact code? The O2 sensor after the Catalytic Converter, or Rear O2 Sensor, could be faulty which would cause the computer to think the Catalytic Converter is not working efficiently. The code can be reset at the auto parts store with the same code reader they used the first time. P0420 is the most commonly thrown OBDII code pertaining to catalytic converter efficiency below threshold. I would replace the O2 sensor after the Catalytic Converter and reset the computer to see if the code comes back. If it comes back you may have a bad catalytic converter, exhaust leak, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc.

Apr 26, 2011 | Nissan Altima Cars & Trucks

2 Answers

Need to pass emissions test, dianostic test - Catalyst efficiency blow threshold (bank 1) tried to order part - now I need to know if it pre or post, left or right Oxygen sensor, can it be determined by...


Yes it can be determined by the DTC (Data Trouble code). If the DTC is P0420 (catalyst system efficiency below threshold Bank-1) then the side of the engine with the #1 spark plug and cylinder is always Bank-1, and the O2 sensor that monitors the catalyst efficiency is usually after or (post) of the catalytic converter.

The #1 cylinder is located at the front spark plug on the right or the passenger side of the vehicle, so Bank-1 is on the right side of the vehicle, and the O2 sensor that monitors the catalyst efficiency should be located after or (post) of the catalytic converter. It would be the post right O2 sensor.

There is also the possibility that the catalytic converter is actually starting to fail, and if changing the O2 sensor and clearing the DTC does not solve the problem them the catalytic converter is most likely faulty.

Aug 12, 2010 | 2002 Jaguar X-Type

1 Answer

Where is the O2 sensor located?


There are total of four O2 sensors.

Two before the catalytic converter and two after the catalytic converter.

If you vehicle has over 160,000 miles or failing emission test then you should test the efficiency of the catalytic converters.

The exit temp should be few degree higher then the inlet temp.



Jul 14, 2010 | 1996 Ford Explorer

1 Answer

My 2000 dodge durango failed the emissions due to a bad catalytic converter... The check engine light did not come on. Could there be any other reason why it would fail?


really need more info on your durango ? millage , engine , other causes for poor emissions are weak motors , poor gas , tuneup problems and worn emission parts like lazy O2 sensors and catalytic converters

Apr 09, 2010 | 2000 Dodge Durango

3 Answers

Check Engine Light was came up with code po430.


its going to be either an o2 sensor(bank 2) or a catalytic converter

Jan 13, 2010 | 1997 Ford Thunderbird LX

3 Answers

Pulled code p0420 on 99 chevy astro, 2wd, v6


from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

causes

A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
possible soloutions

Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


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Aug 20, 2009 | 1999 Chevrolet Astro

1 Answer

Code P0420


P0420 Catalyst System Efficiency Below Threshold (Bank 1)

There is one 02 sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.

Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter

Mar 24, 2009 | Chrysler Concorde Cars & Trucks

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