Skip the auto shop - Our mechanics make house calls

Q: Power loss when driving.

asked by on

I get a code P0171 and the car is suffering from a loss of power.

A: P0171 is a system lean fault in bank 1. Pos...

P0171 is a system lean fault in bank 1. Possible causes could range from a faulty air mass sensor, EGR valve, induction system leak, or oxygen sensor. The induction system may need to be smoked checked for leaks. The oxygen sensor voltage sweeps need to be checked as consistently low voltage readings may indicate an aged or faulty oxygen sensor. All of these symptoms can be the causes leaning towards the loss of power on your vehicle, which can be inspected by a mechanic. You may want to enlist the help of a mechanic, like one from YourMechanic, who has the training and diagnostic equipment to accurately determine the cause of the fault code and make the necessary repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Makes a clicking sound

A clicking or ticking sound can be coming from lots of components. Lack of engine oil, low oil level, or poor oil pressure can cause the engine to make a loud clicking or ticking sound. If it were the engine...

Q: Acceleration Problems

Hi there Leo. Back in the 1980's, the Jeep Wrangler was a hot button topic for insurance companies and automotive regulatory boards (like SEMA and FIA) due to their instability at higher speeds. This caused Jeep to integrate a governor...

Q: Battery dying daily 2008 Audi TT

Hello - the recent stereo wiring is suspect here of course! This problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), then, one at a time,...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...