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.

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!
  1. Home
  2. Questions
  3. Power loss when driving.

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: Looking to buy 07 Audi S8 what should I look for besides the obvious?

Hello there, when buying a used car especially a rare car such as the 2007 Audi S8 care should be taken as repairs can be expensive. The only way to be aware of any potential issues is to have the...

Q: How do I use the delayed locking feature?

The delayed locking feature is present on some models of the vehicle. The feature occurs automatically whenever the door lock switch is pressed inside of the vehicle while a door is open. When all doors are closed, the vehicle will...

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

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.