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Engine light on code p1151 on 99 mercury cougar v6 2.5l engine

It came on a long time ago and each time I take the code out it comes back in a couple days. It does not seem to drive any different. It sounds like lots of people are having this problem. ant ideas as to what is causing this? Thanks Lorna

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P1151 (Natural Gas), Lack of HO2S-21 Switch, Sensor Indicates Lean. P1151, Lack of HO2S-21 Switch, Sensor Indicates Lean.
one of your oxygen sensors are bad, or has a bad connection.

Posted on Oct 04, 2009

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