P0172 Diagnostic Trouble Code Discussion for August 2021
Fuel System Rich (Bank 1)
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| Help Request | Posted | |
| 2016 Volkswagen GTI SE 2.0L Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 3VWYT7AU4G P0172: Fuel trim Bank 1 System too rich. Hey there, working on 2016 GTI, 123k miles. Came in running poorly, hard misses on cylinder 2. Found very heavy carbon build up on all 4 cylinders (customer never had carbon cleaning before). Removed manifold and water pump (due to coolant leak) and found ... |
August 02, 2021 |
