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The Water Cooler
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<blockquote data-quote="918evo" data-source="post: 4096655" data-attributes="member: 6001"><p>I've never heard of aftermarket cats causing damage to o2 sensors, but they aren't as reliable as OEM cats. I usually just use a spark plug fouler or delete the CEL in the ecu/PCM if it's an older car and cat replacement isn't affordable. HPTuners license for that car is $100 and you can delete the catalyst check engine light. Catalyst inefficiency CEL can also be triggered by a thermostat sticking and not getting up to temp quickly enough. The engine needs to be nice and warm to run efficiently and the secondary o2s need to be 600 degrees or so to work properly.</p><p></p><p>For the oil pressure switch, it is probably just wet. Pressurized water can push past the electrical plug seals and get stuck. Unplug it and dry off the sensor and plug.</p></blockquote><p></p>
[QUOTE="918evo, post: 4096655, member: 6001"] I've never heard of aftermarket cats causing damage to o2 sensors, but they aren't as reliable as OEM cats. I usually just use a spark plug fouler or delete the CEL in the ecu/PCM if it's an older car and cat replacement isn't affordable. HPTuners license for that car is $100 and you can delete the catalyst check engine light. Catalyst inefficiency CEL can also be triggered by a thermostat sticking and not getting up to temp quickly enough. The engine needs to be nice and warm to run efficiently and the secondary o2s need to be 600 degrees or so to work properly. For the oil pressure switch, it is probably just wet. Pressurized water can push past the electrical plug seals and get stuck. Unplug it and dry off the sensor and plug. [/QUOTE]
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