![]() The cat test, however, sometimes passes and sometimes does not. I think that 1.99 is the value of a new sensor. Both sensors check OK and the pre cat o2 sensor's aging reads 1.5xx to 1.99. The self tests in basic settings all pass. 1K.which is in limits according to the VagCom.weird thing is that sometimes the rear o2 sensor resistance doesn't register at first (did this with the old sensor too). The pre o2 heater resistance is like 78 ohms, where the post cat o2 is. While looking at the measuring blocks, the post o2 sensor shows 000 until the cat warms up and then it reads the 110 it is supposed to. ![]() I replaced the rear o2 sensor with an OEM from so again, unless it it s dud, it's not that either. I got a brand new cat under warranty last August so unless I got a dud, it is not that. I know there are many threads on this subject, but this is unique. My 2002 Jetta Wagon 2.0 keeps throwing the P0420 code.
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