borescope reduce diagnostic time compare to old fashion way of performing a vacuum test to prove that the cylinder is leaking due to head gasket. It is primary use in aircraft maintenance because it magnify discontinuities that cannot be detected by the naked eye and ii) to permit visual checks of critical areas not accessible to unaided eye and difficult for other nondestructive tests.
When you took your Audi to check for the oil light. There was no engine light and that is what surprised you about the misfire code.
Before engine light is shown on the dash, computer store some code(s) in pending zone, that mean it 's counting until it happens a certain number of times before releasing the light on the dash. Most new scan tools can read both trouble codes "code that causes trouble right now " and pending codes" code that are pending but are not trouble yet to illuminate engine light." When they become trouble, the check engine light comes on.
I believe your mechanic have found the misfire code in "pending" leading to the use of borescope.
What he should do is to fix the oil light and advice you that your engine may be in trouble in the future because there might be a head gasket problem.
The decision should be up to you to take the car to another mechanic if you suspect your engine is misfiring and you get engine light.
It is unprofessional to drag you into cost of repair for which you did not bring the car for. You should get a second mechanic opinion so you can decide what you want to do.
Sunday, May 2nd, 2010 AT 11:53 PM