Check Engine Light Caused By Exhaust Leak

[Guy Brideau]

my check engine light came on had a mechanic look at it and said the oxegen sensor is giving out this code because the exhaust manifold gasket is leaking making it run too lean so he wants me to replace three gaskets does this sound about right the dealer said its a good possiblity since the oxegen sensor itself rarelly falze any input thanks

[KiaMech]

If you had a leaking gasket the sensor would THINK the engine is running lean, so it would add fuel and end up making the engine run rich. A bad sensor or a leaking gasket could both cause this code. Because he said to replace gaskets, I'm assuming he did check the sensor and/or heard the leak (possibly with a stethoscope).

[Guy Brideau]

Thanks for the response

[Guy Brideau]