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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 11-17-2008, 07:49 PM   #1 (permalink)
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Fault Code 1222

Ok so I've got my 95 318ti with a bad idle sometimes, thought it was the MAF sensor and replaced it, car runs better but everyonce in a while it almost dies at the stoplight, and the check engine light comes on under heavy acceleration sometimes. Did the, key in pos2 and stop gas 5times and got code 1222, Lambda Control 1, what the heck is this and how do I fix it??
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Old 11-17-2008, 11:25 PM   #2 (permalink)
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that code is for 02 sensors, when's the last time they were replaced?
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Old 11-18-2008, 12:24 AM   #3 (permalink)
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not sure....only have had the car for about a week, got a new o2 sensor sitting here but wasn't sure if it would solve the problem or not.
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Old 11-18-2008, 08:06 AM   #4 (permalink)
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yup that should fix it
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Old 11-18-2008, 09:35 AM   #5 (permalink)
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ok I'll try that today and hope it works but what could the o2 sensor have to do with a rough idle????
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Old 11-18-2008, 11:41 AM   #6 (permalink)
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Well that could be the cause of the rough idle. An 02 sensor measures the air/fuel ratio in the exhaust gases and tells the engine computer if it's running lean or rich. This in turn determines the amount of fuel that your engine puts into the combustion chamber trying to maintain the perfect air to fuel ratio for gasoline burning in oxygen. If the 02 sensor fails then the engine computer doesn't know how much fuel to burn in order to maintain that ratio and just does whatever it wants. Thing is the amount of fuel to burn to maintain that ratio changes with numerous different conditions, how hot the engine is, the ambient temperature, how hard you're hitting the gas that sort of thing. Rough idle can also be due to a dirty idle control valve, malfunctioning maf, vacuum leaks a lot of stuff really
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