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Before you go and buy the O2 sensor, like everybody does, get a hose of a least to feet in length, put it against your ear, and the other end, towards the engine, start listening for a hissing sound from the engine, which means there is a vacuum leak, either, from the gasket in your intake manifold, or somewhere on the side of your engine where cylinder one is located., Since the code is related to that side of your engine.

Check all vacuum hoses for cracks and make sure they are secured in place.

Low fuel pressure or a restricted fuel filter can also cause that code to pop up. Have the fuel pressure and flow checked also.

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15y ago

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