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Who's at Fault?...Top 10 Domestic Diagnostic Codes & Fixes Billings MT

A diagnostic trouble code (DTC) certainly helps, but it only tells you that some kind of fault has occurred, and maybe the circuit or component associated with the fault. But no code by itself can tell you which part to replace, because in many instances any one of several causes may have set the code. Keep that in mind as you read about the codes below and the fixes that may solve these faults.

Safelite Auto Glass
(888) 820-2558
3409 Montana Ave
Billings, MT
Brown's Auto Service
(406) 259-6131
1144 Broadwater Avenue
Billings, MT
CARSTAR Auto Body Specialists
(406) 259-1856, 001-2004
1342 Main Street
Billings, MT
Safelite Auto Glass
(888) 820-2558
1002 Main St
Billings, MT
Mufflers and More
(406) 256-2220
12 Grand Avenue
Billings, MT
Archies Ford Stores
(406) 652-0696
2133 king ave w
Billings, MT
Archie Cochrane Ford (Bodyshop Dept.)
(406) 656-1103
2133 King Avenue West
Billings, MT
Chassis Works, Inc.
(406) 245-3338, 001-2004
703 Anchor Street
Billings, MT
Duck''s Painting Shop
(406) 259-4715
1443 Coulson Rd
Billings, MT
J and K Small Engine Repair Inc
(406) 245-6422
215 S 28th Street
Billings, MT
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Who's at Fault?...Top 10 Domestic Diagnostic Codes & Fixes

By Larry Carley  
August 01, 2007

A Check Engine Light that's illuminated is always a sign that something is wrong. But what? You usually can't tell until you plug in a code reader or scan tool and read out the code(s) that have turned on the light. At least then you have a starting point for further diagnosis.

Some people think a code is all you need to fix a fault and turn off the Check Engine Light (or Malfunction Indicator Lamp or MIL). A diagnostic trouble code (DTC) certainly helps, but it only tells you that some kind of fault has occurred, and maybe the circuit or component associated with the fault. But no code by itself can tell you which part to replace, because in many instances any one of several causes may have set the code. Keep that in mind as you read about the codes below and the fixes that may solve these faults.

P0300 Random Misfire Code
(Ford, GM or Chrysler)

Here's a code that tells you the engine is misfiring, but it won't tell you why. The cause could be fuel, ignition or compression, so to diagnose this fault there are number of things you have to check.

A random misfire code means multiple cylinders are misfiring, and in many cases the underlying cause is a vacuum leak. But as we just said, it might also be due to low fuel pressure, dirty fuel injectors, worn or fouled spark plugs, bad plug wires or a weak spark (low coil voltage).

The first thing you do with a P0300 code is to look and listen for possible vacuum l...

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