If car starts drive and when codes appear get tune up
P0174
Generic Definition
Fuel Trim Bank Two Condition Probable Cause[s] Fuel trim bank one condition Probable Cause[s]
- The ECM has detected a rich or lean air/fuel ratio condition on engine bank two
P0171
Generic Definition
- The powertrain control module uses the oxygen sensor to calculate the air/fuel ratio of the engine. The computer has recognized a rich or lean condition on one engine bank only.
SOURCE: trouble codes 171, 174, 137 & 401 came on after engine replacemen
did they ever reflash the ecm with the new codes for the motor
SOURCE: check engine light on computer codes 171 174
switch, we run off snitches. 171 174 banks 1 & 2 Lean. Most likely cause are Upper Intake Manifold Gaskets, failed seals. It's not 1990 on. It's 1996 and on OBD2.
SOURCE: codes #171 & 174
first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2)
SOURCE: 200 lincoln ls 3.9 codes 171 174 300
171 and 174 mean it is running lean and 300 means a random cylinder misfire
SOURCE: Codes 171 174 2002 gmc sierra 5.3
Try some injector cleaner in order to see if the lean condition improves. Lean conditions can sometimes be caused by o2 sensors or other sensors that are not within specifications.
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