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Old 05-13-2017, 01:17 PM   #1
Lisbeth
 
Drives: Toyota Yaris
Join Date: May 2017
Location: Europe
Posts: 6
Unhappy Check engine light + vibration

Hi all,

Can someone help me diagnose my mom's car? She's taken it to two repair shops (including Toyota's) but the problem keeps persisting. She's spent so much money on this car for this same issue, it's unbelievable.

The check engine light keeps coming on. Sometimes blinking, sometimes constant light. Sometimes not at all. When the check engine light is on, there's a noticeable vibration coming from the engine, and it seems to need a bit more gas when accelerating. The light comes on (blinking on constant) maybe 1 out of 5 times we drive it.

The first time we took it to Toyota's maintenance, they couldn't find a cause for the engine light coming on, but they changed the spark plugs and did a little magic with their computers to make the light go away. And it stayed away for a day or so.

We took it to another repair shop and told them about the check engine light and that they changed the spark plugs at Toyota's own repair, but the problem came back. They did their own check and found that one of the ignition coils was broken, so they replaced and fixed that along with a "cover for the exhaust pipe that was coming off" -> quotes because I don't have a clue what that means, but I'm sure that wasn't the main reason for the problem here, more cosmetic?

After this fix, it was again a day or two that the problem stayed away. As it takes 150 € for a repair every few days, this is getting costly!

So can anyone identify the problem here: The engine light comes on occasionally (either blinking or constantly) at random times. It does this for the whole time the car is running (going from place A to place B), restarting doesn't seem to help. The light doesn't come on at every run, though, only in about 1/5.

When the light is on, there's a noticeable vibration in the car, seeming to come from the engine or the floor. Accelerating seems slower than usual, having to press the gas a little more aggressively. Occasionally, especially when accelerating, there's a vibrating feel to the tires too, like driving on logs or running on flat tires (tires fine).

The symptoms only come when the engine light is on. When the engine light is off, the car runs fine. I've also noticed a strongish exhaust smell when I get out of the car, especially when the light is on. The smell seems to be coming from somewhere around the back right wheel.

Could this problem still be in the ignition coils or spark plugs? Is there any other reason that could be causing this?

Thanks in advance to anyone for help!
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