Q: Paid $2900 for replacing 6 engine coils, replacing spark plugs & brake work. Cat converter now issue 2009 Buick Enclave

asked by on June 19, 2017

I took my vehicle to the dealership & dreaded hearing the $2900 quote for repairs, much less to replace the bad 1 coil, told better off to replace 6 coils because they regular fail soon thereafter & then you incur labor charges all over. I sucked it up & paid. Drove great for 1 - 1 1/2 days. Then sounded sluggish. Check engine light came on in a few days. To dealership. Cat converter code. re-set it & said it didn't come back on so just drive it. Told me that replacing the coils probably caused fuel to enter the Cat and it would likely just burn off. Keep driving. Return if light came back on because then Cat converter needs replaced. Said $1200. I didn't have the $2900 let alone $1200 more. Comes a place when you have to stop pouring cash into the vehicle but I cannot afford to replace it. Wouldn't dealership be liable for the repair cost if they leaked fuel in to the Cat and ruined it in their pricey engine coil replacement job? I read fuel entering it ruins it.

My car has 122000 miles.
My car has an automatic transmission.

Hi there. The fact that the vehicle needed this work in the first place is what would have caused the converter to fail. When a cylinder misfires from bad plugs or coils then the excessive fuel will ruin a converter. The dealer is not responsible for the converter but they should have been able to tell you that it was bad prior to replacing all of the other parts. That would have then allowed you to make a better decision as to whether or not you want to fix it. I would bring this to their attention and they should give you a partial reimbursement due to the faulty diagnosis.

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

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

Battery light on and vehicle died while driving

Hi and thank you for contacting YourMechanic. First thing to do is get the new battery checked and new alternator checked. In my years as a mechanic, there has been multiple times when I have installed a new out-of-the-box item...

Where is the O2 sensor located?

Hi, thanks for writing in. On most Dodge, GM and Ford V-6 engines, sensor 2 bank 2 is located passenger side, rear of the engine compartment. The 2011 Dodge Charger V-6 has four O2 sensors, but this one is it'll...

My anti theft system is activated and my car won't start. I didn't know there was even an alarm on the car. I've tried everything

Your anti-theft system (pass-lock) may have a fault or it may be the key itself. The keys have a chip embedded in them. When inserted into the ignition, the alarm system looks for codes from the key. Try another key...

Related articles

How to Prevent Catalytic Converter Theft
Catalytic converters are easily accessible to thieves looking to make a profit from the precious metals inside.
Buick Certified Pre-Owned (CPO) Car Program
If If you’re in the market for a used Buick vehicle, you may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on...
What Does the Catalytic Converter Warning Light Mean?
The catalytic converter warning light means the catalytic converter in your engine may not be working properly, possibly due to overheating.