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Who's at Fault?...Top 10 Domestic Diagnostic Codes & Fixes Newark NJ

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.

K N R Auto Specialist
(973) 692-8916
Serving Your Area
Harrison, NJ
Belford Tire & Auto Center
(908) 967-5583
454 Chestnut St
Union, NJ
Lordi Autobody
(973) 826-7974
200 Howe Ave
Passaic, NJ
Top Quality Auto Center
(973) 826-7765
214 Trimble Ave
Clifton, NJ
Allwood Auto Care
(973) 995-1190
76 Sidney Street
Lodi, NJ
AutoBahn Tuning
(973) 498-8743
18 Mott St.
Newark, NJ
Sea Breeze Auto & Tire Clinic
(973) 932-0974
342 Broad Street
Bloomfield, NJ
Zaloom's Auto Repair
(718) 218-5308
2041 Victory Blvd
Staten Island, NY
Dem Automotive
(718) 218-5385
340 64th
Brookyln, NY
Dr. Marv's Transmission & Complete Auto Care
(908) 349-1665
1754 E 2nd St
Scotch Plains, NJ
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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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