Q: Error code 171

asked by on

I want to know what's the issue for this code? Will O2 Sensor be the issue?

My car has 120000 miles.
My car has an automatic transmission.

Hello. If you are referring to trouble code P0171, then there may be a few different potential causes. P0171 is the trouble code for a lean condition at bank 1 of the vehicle’s engine. A lean condition occurs when the air fuel ratio becomes disturbed due to a lack of fuel, usually due to a fault in the fuel system. A lean condition can cause all sorts of issues such as a loss in power, fuel efficiency, and in serious cases even engine damage. Common causes are a faulty fuel pump, injectors, or fuel pressure regulator. Many other things, including a faulty oxygen sensor, can also cause the vehicle to cause that code to come up. The sensor would have to be tested to determine if it is what is causing the problem. If you are unsure, I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose the cause of the trouble code.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Error code 171

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: Steering wheel hard turning on 2007 Volvo V50

According to the service I use to make recommendations by mileage, the change interval for the timing belt is 120,000 miles. 100,000 miles is a little early, but it is better to perform services like these earlier rather than late...

Q: Vacuum hose is off and oil is going fast

Hi and thanks for contacting YourMechanic. First you will need to fix the vacuum hose. all vacuum hoses need to be either hooked up or plugged off is not in use. For the oil consumption, check the tail pipe for...

Q: How long can I ride on bad struts

Hello, thank you for writing in. The time you have will completely depend on how bad the struts are now, and how much stress you want to put onto the rest of the vehicle. Worn struts will cause stress to...

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...
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...
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.