P0171 lean bank 1
Moderator
Joined: 01-23-2009
Posts: 26,532
From: Fredericksburg,VA
From post #1
i did this test: " Started the engine, unplug the sensor and drive it" the rough driving and pulling dissapeared, actually drove nicely
Now the CEL comes on with 6 DTC codes when you disconnect it!?
That is what I mean.
BTW, that test would be positive if unplugging it made NO difference in drivability.
Have you bothered to check the other things that were suggested? The flex pipe and EVAP purge valve being the common causes.
Just because the CEL is not on NOW does not mean there is no pending code.
i did this test: " Started the engine, unplug the sensor and drive it" the rough driving and pulling dissapeared, actually drove nicely
Now the CEL comes on with 6 DTC codes when you disconnect it!?
That is what I mean.
BTW, that test would be positive if unplugging it made NO difference in drivability.
Have you bothered to check the other things that were suggested? The flex pipe and EVAP purge valve being the common causes.
Just because the CEL is not on NOW does not mean there is no pending code.
Joined: 05-06-2022
Posts: 1
From: Georgia
Thats a good information to know !
I have questions that may be easier for you guys to answer:
1. The only problem now is to start the car... it may take 4 or 5 tries. OnCE it starts, it runs fine. No hesitation, no rough idle, no pulling. If it was a bad fuel pump, shouldnt i have problems also while driving???
Where would you start checking for the problem ???
I have questions that may be easier for you guys to answer:
1. The only problem now is to start the car... it may take 4 or 5 tries. OnCE it starts, it runs fine. No hesitation, no rough idle, no pulling. If it was a bad fuel pump, shouldnt i have problems also while driving???
Where would you start checking for the problem ???
Senior Member
Joined: 03-29-2022
Posts: 1,241
From: Davison MI
I had this problem and after trying all sorts of fixes, turn out that it was a short in the crankshaft position sensor wires. After replacing the sensor and repairing the wire, it cranks with no problem. The sensor is located on the driver's side front of the block beside the oil filter. Its bolted into the block by one nut. A little difficult to maneuver the ratchet but I managed. Hope this helps.
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