Skip the auto shop - Our mechanics make house calls

Q: i have been noticing increasing poor acceleration performance & bad gas mileage and now my check engine light is on

asked by on

I was told about a year ago that my mdx could use a valve adjustment, but havent been able to afford it, could that be why the check engine light has come on now? I just had it smogged a couple weeks ago & it passed. (I do know that it's overdue for an oil change & tune-up)

My car has 200000 miles.
My car has an automatic transmission.

A: If the Check Engine Light is on then you wo...

If the Check Engine Light is on then you would need to have the computer checked to see if the code received pertains to the problems you are having. Not getting the valves adjusted may start to cause misfire codes. The engine will then run rough, misfire, or have other running issues that would be corrected by the valve adjustment. The best suggestion is to have the computer checked by a mechanic to diagnose the Check Engine Light code and problems you’re experiencing to find the right fix.

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: Ok ..... My radiator went bad and I replaced it today, when I was done of course I crunk the car (07 Nissan Altima 3.5). While in

Hello, thank you for writing in. Chances are that you had to remove the A/C condenser in order to remove the radiator. In order to remove the condenser you have to remove the drive belts. It is likely this drive...

Q: When accelerating my steering wheel shimmers, like a slight wobble only while accelerating

Failure of the outer CV joints would more likely cause audible clicking or clunking on turns and not vibration. And, if the rubber boots are intact on the driveshafts (especially on the outer CV joints), it is not likely there...

Q: Check Engine Light

Hi there. You might want to read this article that explains what causes the P0300 OBD-II error codes. If more than one cylinder misfires, this will increase or decrease the revolutions per minute (RPM) of the crankshaft. If that increase...

Related articles

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...
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.