Check engine light came on. (84,500 miles on the 2001 V6) I had
Autozone test it. Says O2 sensor is failing. But he mumbled about it
being the "second bank" sensor. I never clearly understood what he was
trying to explain, I think the readout on the testor said "PO128."
Any idea what that means? Are both sensors the same? How hard is it to
crawl under there and replace?
Well, actually you have four sensors - two pre-cat and two post-cat. You
need to know the exact code to pinpoint which sensor it's complaining about.
You don't need to go back to Autozone, though - you can read your codes by
cycling the ignition key. Start with the ignition in the 'OFF' position.
Turn it ON, then OFF, then ON, then OFF, then ON. Leave it in the ON
position on the third time (you need to do this all within about 2 seconds).
Watch the odometer. It will display all it's stored diagnostic codes,
finishing with 'Pdone'. Write the codes down, and post them back here. You
can also look them up at the following web site (among hundreds of others):
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