Out of no where my service engine light came on,truck runs fine,what could it be?Needs front rotors as they just started grinding about three days before the light came on.Are they linked to this light perhaps?

 

no...the engine control module picked something up...the only way tro know is to get er scanned

 

local o'reilly just started doing it for free here... now pretty much all parts stores do i guess..

 

any autozone will do it for free, it only takes about 5 seconds

 

the bad thing about having a auto parts store do the scan is that they don't know **** about cars, so they are gonna say it could be like 10 different things, and they want you to buy ****.

 

Thats why you have them write down the codes and you personally look them up.

 

$100 buys a scanner that will tell you the code and description. I use my own, then call the dealder for more info relating to the code

 

take it to a firestone and its 79.99 and they will scan it and then pinpoin it and tell you how to fix it.. if they fix it it comes witha warranty!

 

Have you washed the engine bay lately or driven through alot of water anywhere. There is a know problem with the knock sensor on the rear under the intake manifold of giving false readings. if you get the codes pulled and this is the sensor it is showing. when you replace it put a 1/4 inch bead of silicone around it to build a "flood wall" so it will not happen again. First I would disconect the battery and reset all codes and see if it comes back on.