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・Fair and transparent pricing

Get a quote

What others are asking

Q: How do you check under the car for leaks? Do you have a tool to access the bottom of the vehicle without any issue?

Hello. Yes, the tool you are looking for is commonly referred to as a floor jack. It is a tool that is placed underneath the vehicle, on the vehicle's lift points, and then pumped, usually by hand, to raise the...

Q: Car starts up but stalls and the traction slip symbol comes on. What can cause this?

Hi there. Remove the battery cables and let the vehicle sit for about 30 minutes with no power. Then hook up the battery cables and turn on the key. Let the vehicle sit for about 1 minute. This will allow...

Q: The steering shaft (I believe it's the intermediate shaft) disengaged from the steering column.

Freely turning the steering wheel past the normal extent (travel limits), while the shaft is disconnected from the splined yoke will damage the "clock spring" in the steering column that the air bag relies on to fire. That assembly should...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
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...