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.

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 1,000 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!
  1. Home
  2. Questions
  3. Car turns on and off. The brake and the steering wheel gets harder.

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: Speedometer stop working after part was replaced

The speed sensor that is mounted into the transmission housing on the back side near the firewall. If it was disconnected or damaged during the hose, installation would cause the speedometer and transmission to not work correctly. It may have...

Q: Car keeps stalling when I press on the brakes

Your car has a unit in the fuel injection system called an idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine. This valve...

Q: Steering wheel stiff when parking

Hey there. The two main components for your power steering system are the steering pump and the rack & pinion steering unit. If the power steering pump was run low on fluid for a period of time, it may have...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
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...