Question about 2001 Audi A4
CODE PO 171 SYSTEM TOO LEAN BANK 1 HOW TO FIX THIS?
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Posted on Jan 02, 2017
DTC P0171 and Po174 indicate air/fuel ratio is correcting rich for an overly lean condition. You could have several things causing this 1. fuel system malfuntion 2. EGR system malfunction 3. Air intake vacuum leak 4. Engine oil level to high 5. Incorrect cam timing 6. Restricted air cleaner 7. Faulty PCV system 8. Excessive internal engine wear.
Sorry I could not be more specific. Check for the easy things in this list. Most of the time one of the o2 sensors in bank one has failed and not reading correctly. Same on the 02 Lesabre.
Posted on Mar 01, 2009
vacuum leaks. not the fuel filter. your code says,bank 1. look closely for split vacuums or broken. also, intake manifold leaks. good luck
Posted on Apr 14, 2010
bank too lean mean the engine get not enough gas to burn. computer says that because if the gas not enough, u might get the combustion chamber to get overheated and melt the piston down or anything inside it.
Posted on Nov 23, 2010
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