will a donut gasket on a 99 jetta make ur engine light come on
Never heard of a donut gasket, post photos
It is and exhaust gasket,and yes if bad and leaking the o2 sensor will make engine light come on.
Fresh air can be pulled into the exhaust stream past the O2 sensor giving it a false lean mixture reading. This can trigger the check engine light. HTH. -Jim
Thanks guys you learn something new everyday
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