Q: Code P0171 at autozone took O2 to lean, was told fuel injector, drove a few more miles car overheated, took to pepboys they said 4

asked by on March 15, 2017

P0171 code, bay 1 O2 to lean, googled seemed about 6 things (pvc, o2 sensor, injector, etc) was told at autozone it was an injector. Engine light would come on and go off at times, but always P0171. Then car overheated and took into pepboys, they say codes x4 are thermostat housing cracked. Got email car is fixed went in and they said you didnt get a call, i stated got email car is ready. Service clerk said sorry but its a speed sensor. Asked what is that he said he didnt know. Can you help with this info

My car has 68400 miles.
My car has an automatic transmission.

Hi there. I wish I could say that I’m not surprised; but this is par for the course for these two places. First off, the first warning code you received, the P0171 code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A lean condition occurs when the engine either receives too little fuel or too much air. When the engine is lean, it runs hot, which may have caused your car to overheat. Your car’s speed timing sensor is in use at any point that the engine is running. Because of that, it is subjected to a lot of wear and tear. There are also other issues that could affect its longevity, including contaminants, debris and the like. Additionally, the wiring harness could be damaged, which would prevent the sensor from transmitting information to the car’s computer. I really hope these issues become resolved for you quickly.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

What is the key number?
A key number will be given to you with your set of keys. This number can be used to produce an authorized duplicate key. Write down the number and keep it somewhere safe, but outside of your vehicle. Tips You...
Car ride is bumpy
Hello there. I will be happy to assist you. A classic sign of a broken strut spring is a very bumpy ride. As you know vehicles are very heavy and roads have bumps and are not paved straight. The heavy...
After driving awhile, when idling, RPM drops below 500 & car stalls. Happens rarely but RPM fluctuates, and drops suddenly.
If you are having a stalling problem (https://www.yourmechanic.com/article/how-to-fix-a-stalling-car) then you may have a computer code stored in memory. I suggest having the computer scanned to see if there is any codes stored and diagnose them as needed. The intake hose...
Alternators not working properly
Hello there, a few different faults can be preventing your 1997 Chevy C2500 from charging. The most common would be the alternator (https://www.yourmechanic.com/services/alternator-replacement), battery (https://www.yourmechanic.com/services/battery-replacement), battery cable (https://www.yourmechanic.com/services/battery-cable-replacement), wiring fault, or an open circuit. To diagnose this, the first step...
light smell of gas - 2016 Hyundai Elantra
Hi. It sounds like you are getting a gas vapor odor from a fuel tank venting system. The system is supposed to store the fumes in a carbon canister, and if excessive pressure builds up, this will vent to this...
Back brake light/ tail lights not working properly
Hello. The brake lights are controlled by stoplight switch, contacted by the pedal. If they are cutting off after coming to a complete stop then that may be a sign that there is an issue with the switch, circuit, or...
Why does my vehicle consume so much fuel?
This may be a result of a faulty oxygen sensor. As you may know the oxygen sensors which are part of your emissions system read exhaust gases to determine whether or not the appropriate amount of oxygen is present in...
odometer
Hello, thank you for writing in. The trip reset button is located at the next to the readout. It is hard to see because they are black on black and hidden out of the way. Some models utilize the set...
I have a high pitched squeal when i accelerate, gets worse as rpm raises, new water pump and timing belt
It's possible that the water pump that was installed is faulty. The best way to determine this is to use a mechanic's stethoscope and use it on different areas of the engine to determine where the sound is coming from....

Related articles

A Buyer’s Guide to the 2012 Jeep Patriot
Those Those who love getting off road will often turn to a Jeep. The 2012 Patriot could be a good choice for those who want a quality vehicle for the roads, and when they decide to venture off the beaten...
2005 Jeep Wrangler vs. 2005 Chevrolet Blazer: Which One Should I Buy?
Sport SUVs are a class all of their own; these vehicles are meant for a fun drive through the woods and across the trail – but not necessarily to Grandma’s house! Think instead about going through the creek and through...
The Best Used Cars to Buy for Senior Citizens
Everyone Everyone needs a way to get around. You need to get groceries, get to doctors’ appointments, visit with family and more. However, senior citizens have very different needs when it comes to buying a used car than other demographics....