Does anybody know why a check engine light in the 2004 Tiburon would
come on? It came on several months ago, and was serviced. A sensor was
replaced. About a week later it came on again, was serviced again with
the same sensor replaced. The light came on a third time, where upon it
was found that the "board was loose" and plugged back in.

Now, recently the car was serviced by a new person (got it back late
last week). Today, the check engine light comes on! Am I right to be
suspicious that the dealership did something when it was originally
serviced?

Another thing...the car was involved in a crash where the passenger air
bag went off, but not the driver side. There was no passenger! Could
the non-deployment of the driver air bag be related to the check engine
light? Because, trust me, the air bag should have gone off! (Head on
crash... fast enough speed...)

Thanks!

 

While I don't suspect the dealer did anything to cause the lamp to come on,
it also sounds like they haven't repaired the reason for it coming on. Do
you have any information about what the trouble code was that was stored?
That will tell us what sort of problem the computer seems to have
recognized.

Your check engine lamp is not coming on for no reason. If the lamp comes
on, there is or was something wrong.

The failure of the air bag to deploy has nothing to do with the check
engine lamp. The check engine lamp is controlled by the engine control
module. The air bag is controlled by the air bag control module.