Question about 1998 Volkswagen Jetta

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5 error cods on my 2002 Jetta GLS 1.8 Turbo Engine

I have a 2002 Jetta GLS 1.8 Turbo. I have 5 error codes. Please help!
P0420, P0300, P0301, P0172, P2181.
All spark plugs and coil packs have been replaced.

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P0420= Catalyst System Efficiency Below Threshold Bank 1
P0300=Random/Multiple Cylinder Misfire Detected
P0301=Cylinder 1 Misfire Detected
P0172=System Too Rich Bank 1
P2181=Cooling System Performance
you need to write these down,have someone clear the codes in the car,then go for short ride and recheck which if any code reappears.it's like domino's affect,one sensor can start a chain affect with the others.

Posted on Dec 10, 2009

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Check the performace range of the up stream O2 sensor. A bad O2 snesor will set the code P0172, P0420 and possible misfires on the cylinders (to rich), to much fuel in the cylinders. The P2181 could be caused by a bad temperature sensor or a faulty thermostat. I would go for the temp. sensor or the thermostat first, clear the codes and then drive the vehicle and see if any other code sets. If it does then check &/or change the O2 sensor if faulty, burned out or has slow response.....

Posted on Jan 14, 2010

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I took my car to a mechanic for my check engine light. It came up with 9 codes. P0455, P0172, P0302, P0304, P0305, P0300, P0301, P0303, P0172. I have replaced all the plugs and wires and whatnot. (not sure...


All the P0300 codes are engine miss codes. The P0455 is a catalyst inefficiency code and the P0172 code is a rich mixture code. All of these could be caused by faulty oxygen sensors. What kind of car, engine size and mileage is it?

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I got check engine codes P0300,P0301,P0304 on my 2003 Volkswagen Jetta!!!


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2002 vw jetta 2.0 code P0420


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Sorry, but i don't believe there is an easy, cheap fix. p0420 is a catalytic converter ineffiency code - meaning the cat isn't doing what it is supposed to do and needs to be replaced. google the federal warranty for 2002 to see if it is still covered. i think it's 8years/80,000 miles.

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Wondering what the error code we were told means


First, the check engine light just means you are not meeting emissions right now. Not a big deal. Try disconnecting the battery for 1/2 hour and then reconnect and drive car for 10 miles. It may run rough while it relearns you engine controls again but it often clears the codes.

Now, codes are only 5 digits so I assume the 2 is extra.
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Autozone also does free scans. please rate for me, thanks

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Start and diesss


p0456: evap system. sensor failure
p0172: evap system. intake blocked
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p0300: cylinders misfire. check ht/ignition leads
p0301,303,304,305,306: same ht leads

hope this helps..

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