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Sent to Car Experts January 09 04:33 PM

Chevy Camaro 2000 has a code of 420. I changed the converter and O2 sensor twice already. I checked the injectors, spark plugs, and ignition coils. All cylinders have a compression of 130-135. What other possible problems could give the code of 420. Thank you.

Optional Information:
2000 Chevrolet camaro 5.7

Already Tried:
changed converter, spark plugs, and O2 sensor injectors

Customer (name blocked for privacy)
Status:  Closed   Value: $8
Answer
January 9 4:37 PM (3 minutes and 8 seconds later)
         
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