Question about 1998 Volkswagen Beetle

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Volkswagonbeetle I've have changed cam pos. sensor and o2s rear of the cat. converter.I done this because i had a service eng. light which indicated those were bad but now the codes are cleared i still have a loss of power and at an idle it seems to lope a little

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Check your idle control valve it is on the sid eof the intake.

Posted on Oct 06, 2008

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How many oxygen sensors are there on a 1996 ford explorer 8 cyl., 4.0 eng.


The answer depends on the type of exhaust system you have. You will have either 3 or 4 total O2 sensors on your V8. If you have single exhaust with a single catalytic converter then you will have 3 O2 sensors (2 upstream sensors & one downstream sensor - "up or down stream" meaning before of after the catalytic converter). If you have either dual exhaust and/or two catalytic converters then you have 4 O2 sensors (2 upstream & 2 downstream). If you have an MIL light (malfunction indicator light, or "check engine light") the code will indicate "front bank / bank one", which is one of the 2 upstream O2's before the catalytic converter(s), or "rear bank / bank two", which is one of the O2's after the catalytic converter(s).

Apr 22, 2012 | 1996 Ford Explorer

1 Answer

2001 Toyota Camry - check engine light on - code p0420 - took to mechanic and he just hooked up code scanner and gave p0420 code - without checking anything else he said rear O2 sensor needs to be...


Hello: Code 420 normally indicates a catalytic converter is operating below 60% efficiency. You need to take your car to another shop and request a COMPLETE diagnosis not a dart board guess.

Sep 13, 2011 | 2001 Toyota Camry

1 Answer

Check engine light comes on, will be on for couple days up to two weeks then goes off only to come on again after a while. code po420. I've replaced both o2 sensors and replaced the gas cap, the...


The after market cat is the likely problem. Catalytic converters are not all the same and over time our shop has learned which aftermarket ones will work and which ones will not.

The computer is looking at the downstream O2 sensor (the one after the cat) to determine cat efficiency. If the downstream O2 sensor is switching simular to the upstream O2 sensor (the one before the cat) than the computer interprets this as a bad cat. The rear O2 sensor should hold a steady voltage at idle once the car is warmed up.

Jul 27, 2011 | 2000 Toyota Camry

1 Answer

O2 senor rear how do u change it)?


O2 sensors normally don't require replacement to stop getting an O2 sensor code even on a 13 year old vehicle. They are an "indicator" to notify you that something is wrong. If the rear O2 sensor is causing a MIL light (idiot or engine light) you should check for an exhaust leak first (most common cause). If there is no exhaust leak before the sensor and the motor is running nearly perfectly with no bogging down in power and no loss of fuel mileage you can expect that the catalytic converter may be starting to fail and you are getting an incorrect exhaust mixture after the CAT. If that isn't the problem just try "swapping" a used O2 sensor from a junk yard before you spend any significant money on the sensor itself.

Feb 09, 2011 | 1998 Ford Explorer

3 Answers

2000 Cavalier catalytic converter was stolen/check engine light


The check engine light is probably indicating a catalytic converter malfunction the Oxygen sensor that is located after the cat tells the computer if the cat is functioning properly it is possible the wire has been broken or damaged. To see if the cat is there jack up the car and look under the passenger and driver area of the car follow the exhaust pipe from the front back the first thing the pipe comes to should be the cat it looks like a muffler with a wire going to a sensor after toward the back side of it, I doubt they never installed one but I guess it is possible.

Jan 05, 2010 | Chevrolet Cavalier Cars & Trucks

1 Answer

Engine light codes 02-3151 and P0420


Code P0420 is a code for Catalyst efficiency. The computer is seeing the post Catalytic converter o2 sensor having too much activity. The Cat. should be cleaning the exaust of Hc, co, and Nox. The post cat o2 will read the o2 content in the exhaust and if it moves up and down too much or to high and low, the computer interperates that as the cat not ridding the exhaust of it's pollutants. This indicates that the converter is unable to preform properly. The problem could be a bad cat, o2 sensor (Pre- and/or post cat)or o2 sensor wires, or an air fuel mixture problem that has caused the cat to fail. Many other engine operating system failures can cause the converter to not work properly.

Sep 10, 2009 | 2000 Toyota Corolla

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2001 mitsubishi galant,2.4L eng. Getting DTC 421. Is this code related to the catalytic converter? Check eng. light always on, also DTC 302 showing.


DTC code P0421 is the O2 sensor that indicates a an issue with the Catalytic Converter. Replace the O2 sensor to the Catalytic Converter "the one after Converter" It's common for the sensor to fail and you can pick one up from Auto Zone and they will have the step by step instructions to replacing the O2 sensor. 
DTC code P0302 Indicates a misfire on cylinder #2. Address the spark plug, spark plug wire, and injector. Look for any damages and try running some fuel injector cleaner through the fuel system to clean out the injectors. 
Good luck and hope this helps. 

Aug 11, 2009 | 2001 Mitsubishi Galant

1 Answer

Open circuit in o2 sensor from the ck eng codes 60000 miles on the trk never had a problem could this be cat w/bad function code


An open circuit code for an O2 sensor would not be a catalytic converter. An open cicuit code would normally indicate a faulty O2 sensor. 60,000 miles would be about right for this sensor to go bad, especially with all the additives in todays fuel. Hope this helps

Jul 18, 2009 | 2002 Chevrolet S-10

1 Answer

Check engine light due to Catalytic converter


Without knowing the specific code, I will assume it relates to an inefficient catalytic converter. At this mileage it could very well mean that the catalytic converter is failing to do it's job and needs to be replaced. The computer sets this code when it sees a signal from the rear O2 sensor start to change in time with the front O2 sensor. It should not. If the cat is working, The rear O2 sensor should have a stable output as the cat is supposed to be removing all the oxygen from the exhaust. Sometimes this code will set if the spark plugs or the engine's state of tune has deteriorated and is producing more emission than the cat can handle, the rear O2 sees the overflow and assumes the cat is bad.
At your present mileage, I would strongly suggest changing the spark plugs if they have not been done in the last 20,000 mi. Have the light reset and drive it to see if the code returns. If it does, replace the catalytic converter. I suspect that you do need a cat, but I view the spark plugs as maintenance, and I wouldn't want to put a brand new cat in without the assurance that my old plugs were not going to damage the new one.
Hope this helps,
Dave

May 18, 2009 | 1996 Isuzu Trooper

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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