Q: Car runs lean, check engine light on

asked by on

Lately, my car started to run lean. I've had several repairs done on it. I changed the spark plugs, the fuel filter along with the fuel injector number one. The manifold has been replaced as well. Also, I changed the MAP sensor purge valve. Despite all the repairs, the check engine light is illuminated again and the problem persists. What do you suggest I should do next?

Hello. Thanks for writing in about your 2009 Audi A5 Quattro. If you are having a lean condition, then the fuel pressure needs to be checked. The most common cause of a lean code on this car is either low fuel pressure from a failing fuel pump or a bad air flow sensor. Both need to be tested to see which one is causing this. If you want to have this done, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the Check Engine Light and come up with the appropriate repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car runs lean, check engine light on

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: Q: Car takes 2-3 tries before starting

A few different things can cause the vehicle to have camshaft sensor codes. The most common would be the failure with the camshaft sensor, timing chain damage, improper timing, or a wiring issue. The Check Engine Light should illuminate when...

Q: Engine loses power occasionally

First thing you'd want to do, if you haven't already, is to change the fuel filter. If you did, you'd want to check the catalytic converter, because when the catalytic converter starts to clog up, it can't exit the exhaust...

Q: Engine shudder while driving, burnt rubber smell

Hello. Most of the time, this is the first indication that the timing belt is failing. The timing belt needs to be checked to see if it is going bad. If the belt is fine, then you may have a...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.