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Honda Civic 1997 LX AC and Oxygen Sensor

Old Apr 7, 2010 | 07:27 PM
  #11  
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Originally Posted by RonJ
A bad O2 sensor would not throw code P0420. If you don't have an exhaust leak, then the cat is almost surely dead. But first reset the ECU to see whether the code repeats.
Where you check to see if there exhaust leak?
here how looks


can you pin point where I can check with the pic?

oh another question poly-rib belt any good?
I got those install for belts..

RonJ, I'm very grateful for taking your time help me out... thank you!
 
Old Apr 7, 2010 | 08:05 PM
  #12  
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Look for cracks in the exhaust manifold, it's rather common on these models with the one piece manifold / converter assembly (parts 8, 3, and 4). If you idle the engine and stop up the tailpipe with a rag, there should not be hissing of exhaust leaking anywhere. A visual inspection would need to take the heat shield off-- that's the sheet metal part with the number 8 and the arrow on top of it in the picture.
 
Old Apr 7, 2010 | 08:07 PM
  #13  
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The exhaust system starts at the header (under the aluminum heat shield about where the number 8 is) and below the header is the catalytic converter. Pull off the shield and look for any cracks in the header/cat unit or where the primary or secondary O2 sensors screw in or for a gap between the head and header.

I generally buy OEM timing and drive belts.
 
Old Apr 7, 2010 | 09:18 PM
  #14  
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ok guys I will do that tomorrow... I'll let you know what I find.
 
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