Skip the auto shop - Our mechanics make house calls

Q: I have a p0171 code.idle slightly rough and hesitant

asked by on

I just changed the timing belt due to it breaking.i changed the pulley I changed all 8 plugs.it would rev up real high when I pushed the clutch in.so I changed the throttle body gasket.found a slight tear in it.now my truck throws a check engine light p0171.i need to get it smogged and need fixed asap before I go.i already removed the mass air flow sensor and cleaned.wasnt even dirty.the air filter is sealed properly and no build up.any ideas? Please help

My car has 148000 miles.
My car has a manual transmission.

The P0171 is a trouble code for a lean condition that may be caused by a vacuum leak or malfunctioning oxygen sensor. The vacuum leak is the most common cause for this type of code. The vacuum hoses and crankcase ventilation hoses are common areas for vacuum leaks on your model vehicle. Consider hring an experienced technician like on from YourMechanic who can come out and take a closer look at the vehicle and offer a more personal diagnosis of the check engine trouble code.

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

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: I turn my high beam headlights on and both headlights go out.

Hello, thanks for writing in about your Nissan Frontier. The only way to tell if it is the light bulbs or the switch is to check for power to the bulbs when you switch to high beam. Most of the...

Q: No crank and no start.

Hi there. If the wires connected to the mass air flow sensor (MAF) was broken and all of the wires were touching each other, then the wires would have shorted out the MAF sensor. I recommend repairing the wires and...

Q: Gas tank release doesn't work

First, we must determine which type of system is used. I believe that yours involves a mechanical latch. The gas tank release utilizes a cable mechanism that may have become stretched. A stretched cable cannot offer the same amount of...

Related articles

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.