Code PO420
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98 ThirtyTwo
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Location: Nor Cal
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Code PO420
Whats up everyone. I've been watching this forum for the last 4 years and I have this question maybe someone could answer.
Has anyone ever get a code 0420 "catalyst system efficency below threshold" before??? It comes on randomly. The cat is clean and passes smog no problem. Engine oil is changed every 3k. Spark plugs changed @ 110k. and the car currently has 168k. This code 0420 started happening around 100k. I checked the last emissions recall and my TL is past the dead line.
I was thinking that maybe a straight pipe could fix the problem. The problem got worse and it was throwing code 0420 all the time. So I went and bought a mil eliminator off ebay to fix the problem. Has anyone had luck with those mil eliminators. It still throws a code 0420. The O2 sensor is good by the way.
What do you guys think??
Has anyone ever get a code 0420 "catalyst system efficency below threshold" before??? It comes on randomly. The cat is clean and passes smog no problem. Engine oil is changed every 3k. Spark plugs changed @ 110k. and the car currently has 168k. This code 0420 started happening around 100k. I checked the last emissions recall and my TL is past the dead line.
I was thinking that maybe a straight pipe could fix the problem. The problem got worse and it was throwing code 0420 all the time. So I went and bought a mil eliminator off ebay to fix the problem. Has anyone had luck with those mil eliminators. It still throws a code 0420. The O2 sensor is good by the way.
What do you guys think??
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