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!

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: ABS, ESP, Check engine 2005 Audi A4 1.8T

Prior to condemning the ABS module, there are quite a few tests that must be performed to rule out more common causes. In particular, you always want to rule out what is indeed the most common cause of an ABS...

Q: What does it mean if the Supplemental Air Bag warning light is on in the dash?

The supplemental restraint system (SRS) is designed to help keep you and your passengers safer during certain collisions. If the Supplemental Air Bag light is on in the dash, it indicates a problem with the system. The light should...

Q: Squeak / Grinding Sound only when moving 2013 Mercedes C250

Hi there - thanks for providing a sound sample! Noises are probably the hardest thing to diagnose, even when you can capture a recording like this. I suspect either the brake pad wear warning tab, or the driveshaft center bearing...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...