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: Grinding/popping sound when turning wheels all the way and slight shake in steering wheel/pedals under acceleration.

The problem may be inside the transmission transaxle assembly bearings or in one of the wheel bearings. I recommend having a mechanic like one from YourMechanic come and diagnose the problem to verify and diagnose the problem. It may even...

Q: My engine flutters when i stop at red light or idle

Hi there. Usually when your engine struggles to maintain a smooth idle while in gear it is attributed to fuel system issues ranging from dirty fuel injectors, to idle control valve that is damaged or a mass air flow sensor...

Q: Q: Only drives in reverse

Hello. From what you describe it sounds like your vehicle has experienced some sort of serious mechanical failure. The noises you describe, along with the broken bolt, do sound like they could possibly be associated with a broken axle. In...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.