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Originally Posted by DelCoch
Since it wasn't that way before it was serviced I would say it's something they did or didn't do. Check the vacuum lines, maybe they left one off or loose. Check the spark plug wires, maybe they got a couple crossed or maybe one is shorting out to ground. What kind of spark plugs did they use?
After checking the above I would replace the cap, rotor, plug wires and new (proper) spark plugs.
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When the SES light came on the first time I went back to the shop and they checked that all plug wires were in place and read the error code and said it was the bank1(?) O2 sensor and cleared the code. They said it was 99% certin the O2 sensor needed to be replaced, so they did it but without any result...
I'll try to look over the wires and plugs tonight. Dont know what brand of plugs they used but I think they use Delco...
Another thing we noticed after the service is that when we put it in Drive or Reverse (brake applied) we now hear a allmost like grinding noise that wasn't there before, what could it be?