There is never a letter “O” in the OBDII diagnostic code. The first digit is a letter corresponding to the main system causing the trouble code:
Ford engine codes obd 1 three number code#
What you get is a five-digit alpha-numeric code such as “P0304”. When you retrieve the information from the computer via an OBDII diagnostic scanner, it doesn’t tell you the problem directly, such as “timing too slow” or “misfire in cylinder number four”. The computer has assigned a trouble code to the problem and turned on the trouble light – technically called the Malfunction Indicator Lamp (MIL). The “check engine” or “service engine soon” light is the signal that there is a problem with the vehicle’s emissions. These as well as everything in the vehicle having to do with engine performance and emissions control are continuously monitored by the vehicle’s on-board computer system. Its basic components are the catalytic converter and strategically-placed oxygen sensors. The OBD2 system is primarily for emissions control. from 1996 to the present, domestic and imports.
The “II” is the next generation of emissions standards and codes for all vehicles sold in the U.S. The “OBD” of OBDII – sometimes written OBD-II or just plain OBD2 – stands for On-Board Diagnostics. You’ve hooked up your scanner to the vehicle computer and retrieved the OBDII diagnostic code.
When the “check engine” or “service engine soon” light comes on, it doesn’t tell you what or where the trouble is, only that there’s trouble.
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