Common check engine light codes are listed for you on this page at the bottom. This is not a complete or exhaustive list of every code that could be set in your computer's memory.
Instead, what I did was I went through the entire OBD II code list and picked out codes that I have seen set in the real auto repair world. I also included a short description of what that check engine light means so you do not have to hunt that down elsewhere.
In fact many of the check engine light codes that I deal with on a daily basis are in the P0300-P0400 range. The PO300 series of codes relate to engine misfires. A 300 is for a random misfire as a 301 would be a misfire detected on cylinder number one.
Codes in the p0300-p0308 range often cause the check engine light to flash on and off. This is because these codes are serious and could allow unburnt fuel to pool up in the converter. Flashing check engine light means pull over and tow the vehicle to prevent damage.
The P0400 codes relate to the emissions system specifically for fuel vapor leaks (Gas Cap Codes). These in my opinion are common and can experience intermittent failures (see the auto repair video below). But a lot of times it depends on the exact year, make and model vehicle. Repair trends for diagnostic trouble codes are a moving target as new issues develop regularly.
Check engine light diagnosis
I have a page that covers check engine light diagnosis that focuses on repair and diagnosis of common problems. Note that these articles are about things I run into as a Fleet Technician. Your exact problem might not be covered yet. I add new information on a regular basis, so check back.
If your specific car problems are not addressed by any these articles your best bet would be to follow a factory issued diagnostic chart for the particular service engine soon light failure. I diagnose OBD II check engine light codes all the time.
I still find it necessary to refer to a professional auto repair diagram to efficiently solve the problem. Below the car code list is a link to an online factory car repair manual. That is not only what I use, but I find it to be the most effective tool in your fight against the engine lamp.
Bookmark this auto repair and check engine light codes resource page.
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Gas cap check engine light codes
OBD II check engine light codes definitions
P0016 Crankshaft or Camshaft Timing Misalignment Reported
P1491 Radiator Fan Control Relay Circuit Malfunction
P1494 Evaporative Emission Control System Detection Pump Switch Or Mechanical Fault
P1495 No CCD Messages Received From The BCM
P1740 Auto Trans TCC or Overdrive Solenoid PSI In Gear At 0 MPH
P1756 A/T Governor Pressure Not Equal To Target At 15-20 PSI
P1757 A/T Governor Pressure Above 3 PSI In Gear At 0 MPH
P1762 A/T Governor Pressure Sensor Offset Volts Too High/Low
P1763 A/T Governor Pressure Sensor Signal Too High
P1764 A/T Governor Pressure Sensor Signal Too Low
P1765 A/T Switched Battery Malfunction
P1899 Auto Trans Park Neutral Switch Stuck in Park Position.
The quickest way to diagnose check engine light codes is with a diagram!
Find out more about how these check engine light codes actually help you fix cars. And what makes them set in the computers memory. Also specific articles for repairing the most common car problems. This next link takes you from the
check engine light codes page to more Information
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