Oil pan and o2 sensor


Asked by Kristian Feb 27, 2020 at 04:49 AM about the 2002 Pontiac Grand Prix SE

Question type: Maintenance & Repair

So I have a little knocking noise
for ticking noise inside of mouth
pain right when I first start it up
but once it warms up it goes
away what could it be a second
question is when a code error is
bright out to be your O2 sensor
bank one how do you know if it's
a downstream or Upstream

1 Answer


If the noise is a ticking noise its likely in the valve train and not anything to be too concerned about on an older car like yours. If its a knocking sound it could be a bearing about to go which means its time to start car shopping. When the bearing finally spins, your engine will stop dead without warning and you will be done. Figure that out before spending money on other repairs as it might be time for a new car. I believe there are separate codes for the two O2 sensors so it should be easy to figure out which one it is. The upstream one requires a special socket to get it off the car. Not sure about the downstream one, so if you don't have that tool, you may need to get a shop to do it. Remember, its only an O2 sensor so unless you have to pass a vehicle inspection you can just ignore it if you don't want to spend the money on it. Mine ran that way for a couple of years without a problem, and then after that unpleasant encounter with a Freightliner, it didn't matter any more. But that's another story.

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