How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Kevin C. Your Own Question
Kevin C.
Kevin C., Subaru Master Tech.
Category: Subaru
Satisfied Customers: 1727
Experience:  34 years of Subaru service experience, ASE Master Technician.
Type Your Subaru Question Here...
Kevin C. is online now
A new question is answered every 9 seconds

Check engine light came on, with code p0171 system too lean

Customer Question

check engine light came on, with code p0171 system too lean bank 1, changed lambda sensor and now the maf sensor but the light still comes on (not flashing) the car runs perfectly,no misfire or any other symptoms, any suggestions ?
Regards, Rob
Submitted: 7 months ago.
Category: Subaru
Expert:  Chad Farhat replied 7 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 7 months ago.

Hey Rob

1- have you checked for vacuum leaks ?

2- can you get me fuel trims reading long term & short term at idle ?

3- on the scanner does the Oxygen sensor fluctuate from 0.1 to 0.9 volts at idle , is the sensor working ?

4- what is the fuel status : at idle , open loop status or closed loop status ?

please let me know

Thank You *****
ASE Certified Technician