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105 Posts
Discussion Starter · #1 ·
My Matrix has a loud squeaky donut gasket only when warm.

I jacked the car up and looked at the gasket and it looks pretty rough. Once the car is warmed up and driven for a bit, when you stop at idle it sounds like there is almost like a drive belt chirp/squeal when in Drive. It goes away in P, R, and N.

Wondering since it is after the front o2 sensor and before the cat, if it is throwing off my back o2 readings?
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