ago in Ford by
Consuming alot more fuel. Engine is lacking alot of power.

1 Answer

+1 vote
ago by
Four cylinder engine has one upstream O2 sensor in the exhaust manifold, and one downstream sensor after the catalytic converter. Downstream sensors are only for checking if the catalytic converter is working properly, it doesn't cause any symptoms except a check engine light. Watch this video to see how to replace the upstream sensor in Fusion:


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