got four codes PO135, PO146, PO147, PO155

2000 CHEVROLET BLAZER
141,000 MILES
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CG02
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2000 chevy blazer 4.3. The service engine light is on and I got four codes PO135, PO146, PO147, PO155. What do these codes mean and what do I need to do to get the service light to turn off so I can inspect it?
Jan 16, 2012 at 11:58 PM
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HMAC300
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those are all O2 sensor circuits. see if the wires leading to them have been burnt from touching the exaust pipes.
Jan 17, 2012 at 12:20 AM
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CG02
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Is the one of the 02 sensor circuits located behind the catalytic converter and is the other one by the exhaust manifold?
Jan 17, 2012 at 12:59 AM
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HMAC300
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yes, one inf fornt and one in back of both converters. bank 1 is left side bank 2 right
Jan 17, 2012 at 1:05 AM