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  1. Member Rides and Project Cars
    I recently was blessed with the "Check Engine Soon" light. always glorious right? codes come back saying my pre-cat is clogging. so, instead of replacing the pre-cat i'm going to put a header on (duh :rambo: ) So i was wondering if i NEEDED a cat on for the car to run without being too rich or...
  2. Troubleshooting and Support
    Hello everyone, I need some help. I have a re-manufactured engine in my car currently at 40,000 miles with no check engine light (automatic transmission). I have gutted the pre-catalytic converter and used spark plug de-fouler with my O2 senor to waive off check engine light (known...
  3. B15 Sentra (2000 - 2006)
    my engine is messed up due to the precat problem and am looking to buy a new or used engine and catalytic converter so anyone with an engine and or cat for sale pm me please.
  4. Troubleshooting and Support
    Ok so I made this other thread just to get a nice and clear response from everyone and to make sure i give u guys extra details to help me out. Ok so my service engine soon light came on about 2 weeks ago. Took it to the shop and it showed catalytic converter blah blah blah P0420. My mechanic...
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