Question about 2002 Chevrolet Silverado 1500
4.8L 120k odometer my smog check printout says: PO135 02 sensor heater fault (bank 1 sensor 1)
Have you even studied obd2 systems at all, or you
just want to throw away money?
You use the codes you get to diagnose a system
with the fault,then only replace a part after component
testing & it fails a test
You don't replace every sensor for no reason
You should know the mileage on them & have an
oscilloscope put on them to check switching times
Posted on Nov 28, 2012
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Posted on Jan 02, 2017
SOURCE: failed smog check
po304 is just that #4 cyl has a problem could be a bad spark plug or a bad plug wire or bolth
if it hasnt had an ign tuneup its time.
the po138 is just telling you one of the cylinders isnt burning all the fuel put into that cyl.
so its just cause and effect.
if ya need any more info let me know
Posted on Oct 01, 2008
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