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O2 sensors S40-V40 2000

My check engine light comes on for a day or two then goes out for another day or two. Code says "inefficient catalytic converter". I replaced the whole exhaust system (both converters) about 4-5 years ago. The O2 sensors are the originals. Is there a way to know if they're working properly and which one is more than likely an issue (pre or post converter)? Thanks!






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New O2 sensors [S40-V40][2000]
posted by  dadx7  on Thu Apr 23 07:36 CST 2009 >


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