Q: Check Engine Light Reappears

asked by on

I had my check engine light come on in March . I had a shop do a smoke test .They replaced gas cap and a sensor .Not even a month later light was back on . This SUV is running fine and I just put new plugs in it . The light went off today . My buddy told me if tanks gets around 1/4 the required test will not be performed and the light will go out . My question is , I had a older Expedition and it was the same issue .Always having the light on and money out my pocket .I just want to know , are these issues usually fixable or am I looking at battling this Check Engine Light forever . I just rather trade the SUV in

My car has 119000 miles.
My car has an automatic transmission.

The mechanic that did the previous work and did a smoke test was doing the correct thing to detect the leak. The only thing is all the leaks were not identified. Have the vehicle tested again and make sure all the tank hoses and fuel fill pipe are tested for leaks. Make sure after any repair is done the system is retested with smoke to verify no other leaks are found. If the problem still exists after this, or you just want to get a second opinion on the cause of the check engine light, you can book an appointment with a different professional technician, such as one from YourMechanic.

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. Check Engine Light Reappears

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: Truck stallsl out when put in gear 1988 Ford F150

Hi there - first task is to check for any problem codes. Your truck has OBD I diagnostics which, although not as precise as OBD II, can still be pretty helpful. Your poor cold start running may be due to...

Q: Truck making noise

Hello, diagnosing a noise is a hands on and must be heard. Since you notice that it is making the noise while starting the car, there are several possible causes. The noise could be coming from the starter, the flywheel,...

Q: Swooshing noise when braking

Brake noises are pretty common. Worn pads can make a rotational scraping noise while driving if the wear indicators are contacting the rotors. The noise will most likely be worse while braking. Performing a visual inspection of your braking system...

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 Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.