Code : P1166
Description : P1166 VOLKSWAGEN Bank 1 Long Term Fuel Trim Range 2 Rich Upper Limits Exceeded
Possible causes :
– High fuel pressure-Blocked return system or failed pressure regulator
– Faulty fuel injector
– EVAP purge solenoid stuck open
– Cylinder misfire
– Correct other codes first
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top
Scroll to Top