Q: Getting several codes fuel system too lean, Misfire cylinder 3 fuel cut off, misfire detected with low fuel

asked by on

BMW started the car from the night before and just started this problem from one day to the other.

My car has 101622 miles.
My car has an automatic transmission.

A: System too lean means that the fuel mixture...

System too lean means that the fuel mixture has moved beyond the ability of the feedback system to compensate. One thing that can cause that is an air leak that enables air to enter the intake system without passing first through the air flow meter. When that code is accompanied by a misfire code, it can mean a vacuum leak somewhere near the cylinder that is mentioned in the code. Check for any broken vacuum hoses, particularly around the #3 cylinder runner. Not finding that, I would suspect a possible intake gasket leak. A YourMechanic certified technician can be dispatched to your location to perform an Engine is misfiring Inspection on your vehicle and help you diagnose and repair this issue.

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: Misfiring when cold in 2002 Hyundai Accent

A lot of times, those noisy injectors flat and wear out when they get old and they need new injectors. What you want to do is have a mechanic, like one from YourMechanic, run a dealer-level scanner on it and...

Q: My car shakes or vibrate at a stop

Hi there: Unfortunately, neither of those three error codes are associated with a component that is causing your vibration issue. The P0135 is related to the O2 sensor, and P0421 and P0401 are related to catalytic converter sensor issues. I...

Q: Wierd rpm spike when coasting in vehicle.

Your car has an automatic transmission and will automatically downshift as the speed of the vehicle slows down. This spike in RPM's is just the downward gear spinning the motor up slightly as it downshifts. Nothing to worry about as...

Related articles

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...
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...
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.