Skip the auto shop - Our mechanics make house calls

Q: Service engine warning, MAF code and O2 sensor code, along with check suspension light are turned on

asked by on

My car has an O2 sensor code on, MAF code as well as service engine warning. I had the sensor fixed. Also, I had the emissions tested along with the replacement of serpentine belts. The check suspension light is on occasionally. The car is very loud usually while idling. After all the checkups, the O2 sensor code is still on, the check engine light is on as well as the MAF code. Please advise me what to do next.

A: Hello, it sounds like you have quite a few ...

Hello, it sounds like you have quite a few things going on. I am going to do my best to break them down for you.

  • First if the engine is very loud when idling and the belt has already been replaced, there may be an issue with the tensioner or idler pulley.

  • Next, the Navigator is known for needing service to the air suspension system as it gets up in miles, the most common causes of these are the air struts themselves have failed, or one of the air lines has a leak.

  • Lastly, if the O2 sensor and MAF are continually coming back after the sensors have been replaced, the most common cause would be either an exhaust leak or a vacuum leak.

Qualified technicians such as the ones at YourMechanic will be able to diagnose these issues and recommend the best path to repair, starting with a diagnosis of your warning lights.

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・Save up to 30%

Get a quote

What others are asking

Q: Overdue for an oil change. Now the car won't run without foot on the gas.

Hi - first task is to get oil back up to level - then check for problem codes, whether the Check Engine Light is illuminated or not. This engine has a large history of ejecting spark plugs out of the...

Q: Why is my engine light on in my 2008 VW Jetta

Hello. From what you are explaining this is due to a failure in the evap system. If you were having trouble with it after fueling then most of the time it is cause by a failure in the purge valve...

Q: Dying at red light, idling sensor issue??

This may be a result of a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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.