Question about 2000 Volkswagen Beetle

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Beetle 2002 p04020 is the code i keep getting,i have changed cat two lamda sensors 1 front 1 rear,throttlebody and crankcase vent pipe.........not a lot left too change

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  • colin white Oct 25, 2008

    i have reset computer then between 70 and 80 miles later it comes back on !! i have had car on gas analiser too and emission are spot on co is zero so it doesnt suggest the cat is u/s either....28 years with vw and this car is not proving to be easy to sort out....

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You need to reset the computer in your car!

Posted on Oct 25, 2008

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Why am i getting engine code p0421 on this 2002 mitsubishi lancer?


this code is lazy cat (or weak or dead)420's are very hard to diagnose
here is the order.
1: NO EXHAUST leaks near any oxy sensor. zero, (cracks, or gaskets) any where near or upstream of any oxy sensor.!!!
2: Engine runs perfectly CEL out running and no stored or live DTCS (besides 421) and engine holds closed loop at hot idle and light flat cruise, steady right foot, if not , the CAT gets punished.
3: good front oxz sensors, a mUST.
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5: a NEW cat.

that is the crash course, can do 100s pages.
but no. just 1.

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How to fix bank 1 sensor 2 O2 sensor on 2002 ford escape


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Apr 11, 2013 | 2002 Ford Escape

1 Answer

Where is the 02 sensor on a2002 lincoln continnetal


There are four sensors on the Continental cat converter. Because it is front wheel drive, the engine is rotated 90 degrees compared to a rear wheel drive. Next up is location. Front O2 sensor should be near the radiator.It will have a green connector where it is plugged into wire harness. It is called left sensor on the frt wheel drive cars. The right hand O2 sensor is downstream on the inlet pipe right above number 2 cat, the one that looks like a catchers mit, ahead of the flex pipe.Sensor 1 reads air/fuel mixture and is commonly called O2 sensor 1. remember green connector. Sensor 2 monitors the function of your catalytic converter and have a blue connector plug. Front wheel drive cars are a bit tougher because everything is 90 degrees off of diagnosis, front,rear, number 1,number 2. BTW, the sensors with blue connectors are called CMS sensors for catalytic monitor system and rarely go bad. Auto Zone scans for free and I would have it scanned before popping 40 bucks for new.

Apr 04, 2013 | 2002 Lincoln LS

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P1155 code for a toyota rav4 2002, engine lite came , took to parts store, put on diognostic machine , this code came up. wat does it mean?


Bank 2 sensor 1 Air fuel sensor heater circuit. This sensor is NOT an O2 sensor, though it operates like one and in the same location(in exhaust stream). Basically the PCM detected that the heater circuit was drawing excessive amperage or no amperage. Usually it's a bad a/f sensor and replacing it will fix it, however, it doesn't rule out the possibility of damaged wiring or an open in the power or ground circuit, or a short in the power or ground circuit.

Hope helps (remember rated this).

Aug 17, 2010 | 2002 Toyota RAV4

1 Answer

Replacing oxygen sensor


beetles have one of two types of o2 sensors one is on the front pipe and is just a large wrench job(pref a long socket)take the wires off first.
the second is on the front box(the cat)and is welded onto the cat.so you need replace both.

Aug 06, 2010 | 1998 Volkswagen Beetle

1 Answer

Where is the o2 sensor located on a 2002 toyota sequoia


There are 4 of them. Two on each exhaust pipe.

One will be before the catalytic converter and one will be after.

Bank 2 is on the passenger side of the car.

Bank 1 is on the drivers side.

position 1 is in front of the cat position is behind the cat.

Each sensor is referred to by bank 1 sensor 2, etc etc.
You have to get at them from under the car. The rear ones are easy to remove the front ones can be an absolute nightmare sometimes.

Jul 23, 2010 | 2002 Toyota Sequoia

2 Answers

My engine exhaust warning light is on, amber, in my 2000 VW Beetle it was MOT-ed just last month and passed is it just a sensor issue or is it more serious?


have the car put on a diagnostic machine,it will tell you straight away.(souds like cat converter or lamda probe.....)

May 12, 2010 | 2000 Volkswagen Beetle

1 Answer

2002 blazer zr2 check engine light code is po155 bank 2 sensor 2 where is it and how do I check it


P0155 is o2 sensor heater circuit malfunction bank 2 sensor 1 it is the o2 sensor circuit in front of the cat converter the o2 sensors are located mounted to the exhaust pipe in front and behind the catylic converter the problem is in the circuit [wiring or sensor itself] check wiring and repair if necessary if the short or open circuit is the sensor need to replace sensor +++ P0161 is 02 sensor heater circuit malfunction BANK 2 SENSOR 2 ++++++ this is the sensor behind the cat converter

Feb 23, 2010 | 2002 Chevrolet Blazer

1 Answer

My 2 litre petrol beetle has developed a random misfire on cylinder 4. We have replaced the HT lead and spark plug but the problem persists. what else could be causing it?


its only an idea but the engine management on the early beetles was a bit primative if your confident swap the injectors over from nos 1-4 and then see if the random missfire moves from cylinders 4 to 1 if it does then you have an injector fault if not let me know as i am a vw master -tech hope this helps
as far as jennablackies fault goes it could be as simple as damaged plug leads which would cause a missfire have you got any fault codes because its obviously nothing to do with cat/lamda probes

Aug 09, 2008 | 2002 Volkswagen Beetle Turbo S

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