1999 chevy silverado check 4 wheel drive light comes on periodically. Dealer says it is a bad sensor. Where is the sensor located? External or internal?
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Can't be to sure with yours. It maybe the switch. On my 2002, I found I had a Transfer Case Control Module issue. Shopped around and found one on Amazon for half the price the local box stores wanted. I would Google this before starting to buy a bunch of parts.
It sounds like a faulty sensor wire on one of the calipers, I'd check the front first because they move around more than the rear. If the brakes have been replaced, sometimes the sensor wires don't get instaaled right and they either don't make contact or they get broken, difficult to put in unless you have experince with the new brake systems.
I had a similar problem with
the Service 4 Wheel Drive light which came on intermittently then became more
consistent in the message center display. It would go into 4 wheel drive if the
message center did not display the Service 4 Wheel Drive message in the message
center, but not when the message was displayed. I found the transfer case
switch module in the dash was defective, and it has been working with no other
problems for three years.
In the valley under the intake, one in the front and one in the back.
It takes about 3 hrs to replace them and it's going to run you around $140 for parts. However, they rarely go bad. Usually it is due to wire chaffing or corrosion due to a coolant leak.
Find out why the engine light is coming on, it is the info u probably need to fix the running rough problem. Most auto parts stores will read the codes stored in your trucks computer for free, write them down, and ask what they mean and how to correct the problem. If u need more info, return to this site w/ codes for further help.
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