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P0171 Diagnostic Trouble Code Discussion for February 2020

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2010 Audi A6 Quattro Avant 3.0L MIL Lamp on VIN: WAU4GAFBXA
P0171: lean bank 1. Car shows P0171 lean mixture bank one. Also p0456, small evap leak. Data stream shows trim numbers short term and long term around 6 to 8% at idle. If the RPM is raised to about 1500 or higher even without any load on the engine the long term trim numbers ...
February 17, 2020
2014 Cadillac ATS Performance 2.0L MIL Lamp on VIN: 1G6AJ5SX5E
P0171: bank 1 lean. car came in with p0171 bank 1 lean found two bulletins first bulletin was to check intake bolt for being loose so i went ahead and smoked the intake system. no leaks found.second bulletin was to check the vac. system for the engine mounts checked withe a v...
February 26, 2020
2014 Cadillac ATS Performance 2.0L MIL Lamp on VIN: 1G6AJ5SX5E
P0171: bank 1 lean. car came in with p0171 bank 1 lean found two bulletins first bulletin was to check intake bolt for being loose so i went ahead and smoked the intake system. no leaks found.second bulletin was to check the vac. system for the engine mounts checked withe a v...
February 27, 2020
2013 Volvo XC60 T6 3.0L Excessive Emissions VIN: YV4902DZ0D
P0171: Bank 1 System Lean. Engine is only lean at idle, so I suspect vacuum leak. Originally when I pulled engine oil dipstick out vacuum could be heard hissing and could suck my finger down. Pulling oil cap off, a very loud hiss is heard. Also the small hole in the diaphragm cover ...
February 27, 2020