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CID 686 CAT Fault Code

Shift ID Code

Cause :

The cause of the problem may lie in the knock sensor, as well as in the use of low-quality oil or in the breakdown of one of the components of the ignition system.Thhis indicates a malfunction in the intake air flow. The cause of the problem may be a loss of tightness or a malfunction of the mass air flow sensor. If the contaminants are not critical, you can clean the flowmeter using a special carburetor.


Don't forget ! When a fault code pops up, CAT's Uptime Center is automatically notified via an cellular link, and it alerts the truck's owner by prearranged methods, usually email or phone calls.

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