Question about 2004 BMW 7 Series

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I have a bmw e46 316i 1999 105hp and my problem is whit an error code 171.i can't solve it.what does it mean.please help!

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  • Anonymous May 20, 2009

    same problem model 2001



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171; check, fuel supply system short circuit to b+

check positive (b+) connections in fuel rails, fuel pumps, fuel injectors, etc....

Posted on Jul 11, 2009


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What does codes 313,171,174 and 500 mean?

The mix-up in categories is problematic here. To answer, the 171, and 174 are lean codes and can be the mass flow meter or fuel pressure when they appear together. The 500 code is for speed sensing and the 313 is a random misfire usually due to low fuel pressure.

Since you have more than 1 indication about fuel pressure, this would be a place to look. As you have a BMW instead of a Ford, the fuel pressure on a Ford is partially determined by the crankshaft sensor and the RPM. Now your 500 Code on a BMW may do something about fuel pressure based on vehicle speed. I am not familiar with BMW. It could be that wheel speed has something to do with available fuel pressure and a misread from your 500 Code is cutting fuel pressure and causing all the other Codes.

You might want to relist under the BMW header with your same question.

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Codes 171 174

It means bank 1 and bank 2 aren't getting enough fuel. This is an indication that an O2 sensor noticed that there is too much oxygen exiting the engine into the exhaust system.
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171 and 174 mean it is running lean and 300 means a random cylinder misfire

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P0171 means the system is lean on cylinder bank number one, with just the one code you could replace the bank one upstream O2 sensor and that will most likely cure the problem.

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171 check, fuel supply system short circuit to b+
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