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 Nissan Frontier Forums : Problems / Technical
Subject Topic: 2001 failed Smog Post ReplyPost New Topic
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madolive3
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Posted: Jun 30 2007 at 1:18am | IP Logged Quote madolive3


 Check engine light is on. It's Code P0420, Catalyst system Efficiency Below Threshold, (bank one). But the levels of HC and co2 passed and were very low. I failed because of the light.  It's a 2001 XE 4 cylinder auto with about 108000 miles.    There are some small leaks in the welds between the o2 sensor and the cat.   I also can't find the Bank one o2 sensor in the FSM....Any help would be greatly appreciated
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shadow0289
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Posted: Jul 08 2007 at 8:37pm | IP Logged Quote shadow0289

You only have a 4 cylinder so you only have one bank. the 1 sensor is before the catalyst, and the 2 sensor is after the catalyst or catalytic convertor.
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