clint cook (70.218.27.219) - Sat Jan 31 00:24:35 2009

i have a 2000 s10 that failed inspection today because of fault code p0420....i was told by inspection station that that usually means oxygen sensor on manifold... i dont want to spend 40 or more $$ and that not be the problem. is ther a way for me to know for sure?

Reply #1 becky (166.204.88.244) - Thu Mar 26 19:01:59 2009

what does code po420 mean on an '01 chevy cavalier?

Reply #2 Ken Stimson (68.61.133.194) - Mon Jun 29 22:11:02 2009

I have 3 different codes pop up on a scanner they are PO442, PO420, and PO740. Does anyone have any idea what these could be caused by? PLease let me know. My truck wont start it just sputters and then dies.

Reply #3 Jon (69.47.191.185) - Wed Sep 23 17:11:35 2009

Code P0420 - Catalyst System Efficiency Below Threashold. This could be a worn out(damaged) catalyst.

Code P0442 - Evaporative Emission Control System Leak (Small) This could be a defective gas cap. Not sure.

Code P0740 - Torque Converter Clutch Circuit Stuck On. This one sounds like you should have your trans checked. Any problems there?

Reply #4 aaron (204.211.138.254) - Mon Nov 2 21:00:38 2009

just put a brand new converter on my s10 blazer and i still have code p0420

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