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Check the tubing going from the air filter to the intake manifold to see if it has come loose. This might account for extra air going into the intake manifold than the computer is aware of. Otherwise it may be due to a faulty(or dirty) MAP/MAF sensor. Another possible cause is from low fuel pressure due to restricted fuel lines or a bad fuel pump.

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โˆ™ 2006-03-01 20:49:26
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Q: How do you fix a code p0171 system to lean bank 1 on a Daewoo Lanos 1999?
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