Po171 code - Cars & Trucks

Thats code for a bad O-2 sensor. That can be caused by antifreeze getting into the exausht. Try clearing the code and putting in a can of Sea-Foam. I have had good success with that cleaning off the sensor.

Lean bank 1 and bank 2 , and throttle actuator system fault. Check reason for lean codes 1st, vacuum leak(s), air inlet boot and hoses, or low fuel pressure / clogged filter. Repair as needed then clear codes and recheck .

https://www.obd-codes.com/p0171

May be of help tracing the route of the prob

mustang forum solution.


http://www.moddedmustangs.com/forums/v6-mustangs/39429-trouble-code-po171.html



I had the same problem. Scroll down in that link.
you are running too lean.
Chip? tune?

This can be caused by a faulty mass air flow sensor

Have 2000 Buick Lesabre custom every time car gets up to operating temp. the engine misses going down the road , also let car sit and idle and it shuts off after about 2 minutes , my code reads PO171 system to lean bank 1, changed co2 censor, mass air flow censor, plug wires, and plugs.

The po300 is a misfire code.This means there is probably a plug,plug wire,ignition coil,or ignition module.Check the coil towers one at a time.These are know for corroding.If you find one that is corroded then replace the plug wire also.Po171 is a lean condition code.The po300 could be causing the po171.If you have not had a tune up Now would be a good time.Hope this helps.Good luck.

code P0300 means random cylinder misfiring, have u checked spark plugs and cables

Check for vacuum leaks, especially the intake manifold gaskets. If those are o.k., clean the Mass air flow sensor.

http://www.obd-codes.com/p0171

Check this website out. Hope it helps!