Skip the auto shop - Our mechanics make house calls

Q: Car turns on and off. The brake and the steering wheel gets harder.

asked by on

The light engine turned on a few days ago and I got it scanned saying P0171 which they told me that I needed to replace the intake manifold gasket. I was going to do myself but then I couldn't do it because of the position of the screws. So I was going to buy an extension and then It turned off while driving. And the car has been shaking.

My car has 155000 miles.
My car has an automatic transmission.

A: Hello, thanks for writing in. The P0171 is ...

Hello, thanks for writing in. The P0171 is an indication of a lean mixture, which can be caused by an air leak in the intake (as you were advised), a borderline engine temp sensor reporting a warmer engine temperature than exists, or a weak oxygen sensor. (There was also a Toyota Technical Service Bulletin which addresses "lean running issues in very cold climates" - #228497.)

If you need assistance with this repair, I would recommend having a rough idle inspection completed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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・Save up to 30%

Get a quote

What others are asking

Q: Yukon--We have replaced the Throttle Position Sensor twice now and the engine light still comes on.

There could be a wiring issue in that area where the oil leak was. You did not mention the code number. You may have two concerns with the vehicle. The car jerking is related to the Check Engine Light being...

Q: Engine stalls out for no reason, what’s wrong?

There a number of things that can cause your vehicle to have this problem. Possible problems include a faulty Mass Airflow Sensor, a Crankshaft Position Sensor, and the Loss of fuel pressure. Intermittent problems can take more time to isolate...

Q: How do you tilt or extend the steering wheel?

Your steering wheel offers both telescopic and tilt operation. Tilting the wheel lets you get the perfect angle for driving safely. Here’s how to do both. To Tilt: Pull the lever on the bottom of the steering column down....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...