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<blockquote data-quote="limch1" data-source="post: 308193" data-attributes="member: 6289"><p>Hi</p><p></p><p>I'm driving a 2001 Hyundai Elantra. Now I always have the CEL on as I do not have any Cat now.</p><p></p><p>The 2nd O2 sensor will generate a different (FLAT) graph after the exhaust gas is filtered through the first cat. If the ECU does not see the expected flat graph/curve, it will generate a CEL indicating low cat efficiency or defective cat (the error code). </p><p></p><p>Currently both my (the 1st O2 and 2nd O2) showing the same curve after scanned by OBDII scanner. Hence the CEL error code showing defective cat.</p><p></p><p>Is there a way to disable the 2nd O2? What I do now is to reset the ECU everytime the CEL on. Please help.</p><p></p><p>Thanks</p><p>charles</p></blockquote><p></p>
[QUOTE="limch1, post: 308193, member: 6289"] Hi I'm driving a 2001 Hyundai Elantra. Now I always have the CEL on as I do not have any Cat now. The 2nd O2 sensor will generate a different (FLAT) graph after the exhaust gas is filtered through the first cat. If the ECU does not see the expected flat graph/curve, it will generate a CEL indicating low cat efficiency or defective cat (the error code). Currently both my (the 1st O2 and 2nd O2) showing the same curve after scanned by OBDII scanner. Hence the CEL error code showing defective cat. Is there a way to disable the 2nd O2? What I do now is to reset the ECU everytime the CEL on. Please help. Thanks charles [/QUOTE]
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