Question about 1999 Volkswagen Beetle

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1999 beetle P0422 which O2 is bad the o2 before the cat or after

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  • Allan May 11, 2010

    Please test to make sure the old sensor is good before replacing it. Sometimes running bad gas or improper octane can set off the O2 sensor (as I have experience before myself). Sensors that go off don't mean they are bad. A lot of times a tripped sensor means it did it's job: "sensing" something isn't right.

    However, if the sensor is actually bad, your local Autozone or Advanced Autoparts should be able to determine that for you as they did for me.

    Good luck!


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P0422 - Catalyst below threshold.

Catalytic converter is clogged or out of medium.

Replace it.


ACTUAL DIAGNOSTIC:

Fault Code Definition
Code P0422 indicates that the Bank 1 Main Catalytic Converter's emissions efficiency has fallen below the minimum allowable limit. This threshold is tracked by a Catalyst Monitoring Oxygen Sensor located on or near the outlet of the Catalytic Converter.

Symptoms

* Check Engine Light will illuminate
* In many cases, no abnormal symptoms may be noticed

Common Problems That Trigger the P0422 Code

* Defective Catalytic Converter
* Engine misfires have damaged the Catalytic Converter
* Internal engine damage resulting in high oil consumption and/or a leaking Head gasket has damaged the Catalytic Converter

Common Misdiagnoses

* Oxygen Sensors are replaced when the real problem is a damaged Catalyst
* Catalyst is replaced when the real problem is internal engine damage, which is producing elevated emissions levels
* Catalyst is replaced when a misfiring engine is the real problem



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Posted on Sep 28, 2010

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1 Answer

How many o2 sensore are on the 99 bravado? I replaced the o2 sensor before the cat converter, now code says bank one( before cat.) needs replacing. are there 4?


the sensor before the cat is NOT an O2 sensor but a HO2S sensor ( two different sensors with different operations). If this is a V6 engine there are 4 sensors -- 2 --HO2S sensors before the cats --one for each bank cat and 2 O2 sensors after the cats.
The fault code would have spelt out the correct sensor for replacing

Jan 24, 2015 | 1999 Oldsmobile Bravada

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Jeep liberty codes


Possible causes
- Warm Up Three Way Catalytic converter deterioration or malfunction
- Exhaust system leaks
- Loose front or rear HO2Ss
- Faulty front heater O2 sensor
- O2 sensors harness is open or shorted
- O2 sensors poor electrical connection
Tech notes
As the code description implies the P0422 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0422 code is combined with other codes, try fixing the other codes first.

Jul 01, 2014 | 2003 Jeep Liberty

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1999 miata has check engine light on. i turned it off and it stayed out for about a month. took to autozone had two codes exuast and cat. converter. whats wrong with this car?


exhaust doesnt sound like a code, there should be more to code than cat or exhaust, the cat code is probably like cta efficencey below thrushold. this means the converter is not working, the cause maybe bad cat or bad oxygen sensors, testing may be needed to see if o2 sensors are working good. the exhaust code i dont know, never heard of exhaust code, they may be caused by the same problem, start with the cat code, have o2 sensors (oyxgen sensor) checked or if over 100,000 miles replace them. if converter is bad it a very good thing to also replace the o2 sensors with the new cat.

Aug 20, 2010 | 1999 Mazda MX-5 Miata

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Have a Volvo V70 XC AWD 2000. P0422 code comes up "efficeincy below threshold". Just replaced the Cat with an after market unit. Code comes back after resetting and driving for 30 miles. Car has 135K miles...


you can do that since you already replace the cat, however the problem may be some where else like maf sensor, intake leaks faulty plugs, coils or fuel injectors

Feb 25, 2010 | 2000 Volvo V70

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Jetta temp sensor related to other codes?


P0422 - Catalyst below threshold.

Catalytic converter is clogged or out of medium.

Replace it.


ACTUAL DIAGNOSTIC:

Fault Code Definition
Code P0422 indicates that the Bank 1 Main Catalytic Converter's emissions efficiency has fallen below the minimum allowable limit. This threshold is tracked by a Catalyst Monitoring Oxygen Sensor located on or near the outlet of the Catalytic Converter.

Symptoms

* Check Engine Light will illuminate
* In many cases, no abnormal symptoms may be noticed

Common Problems That Trigger the P0422 Code

* Defective Catalytic Converter
* Engine misfires have damaged the Catalytic Converter
* Internal engine damage resulting in high oil consumption and/or a leaking Head gasket has damaged the Catalytic Converter

Common Misdiagnoses

* Oxygen Sensors are replaced when the real problem is a damaged Catalyst
* Catalyst is replaced when the real problem is internal engine damage, which is producing elevated emissions levels
* Catalyst is replaced when a misfiring engine is the real problem



Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.!@##

Jul 11, 2009 | 1999 Volkswagen New Jetta

3 Answers

Is p0422 pre or post catalyst sensor


P0422 is a code for catalytic converter efficiency. It shows up if both upstream and downstream O2 sensor read exactly the same indicating the converter isn't working. The only way to get rid of the code and keep it away is to replace the converter. That doesn't mean you need to spend 500 dollars on a factory one. You can buy a universal one and have it welded in if you buy a good quality one. Usually aftermarket ones run about 120-180 dollars

Jun 13, 2009 | 1999 Volkswagen Beetle

1 Answer

Trouble codes


O2 sensor replacement is a good thing to do right away. After this disconnect the positive lead to the battery, wait about 30 seconds and reconnect. This should clear the error codes. Now go somewhere where you can floor it and go through the gears a couple times. This will establish a new acceration curve. If it's a real problem the lights will come back on, if not your good to go.

Mar 25, 2009 | 1999 Volkswagen Beetle

3 Answers

P0422


P0422 does not refer directly to an O2 sensor. That is a different code. P0422 is about the CAT. How many miles you have it and when did you buy it? VW has extended a warranty on the New Beetles for the CAT to 120,000 mi and 10 yrs. I had the same code and took it to the dealer to see if they'd replace the CAT in the warranty and they did. I had 47,000 miles and bought it at the end of Aug 1999, so I just slipped through. They replaced the downstream O2 sensor as well - all free of charge!

Jan 27, 2009 | 1999 Volkswagen Beetle

1 Answer

In a Saturn SL2 1998, I have the check engine soon light on. The codes readings show P0133 and P0422.


P0133 is an oxygen sensor "response too slow" code (meaning it's not getting up to temperature quickly enough, and the computer is assuming damage to its heating element). P0422 is a catalytic converter problem indication (cat is below peak efficiency). It's assuming you have a failure with the primary O2 sensor and that the cat is also bad. Change your O2 sensor first, have the codes cleared, and see if the cat code comes back or if the O2 sensor change fixes both issues.

Jul 29, 2008 | Saturn SL2 Cars & Trucks

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