OBD-I-First Generation OBD - Focused On The Emission Control Systems
OBD-I-First Generation OBD – Focused On The Emission Control Systems

Choose Your OBD Trouble Codes Help Topic Below

OBD Trouble Codes

OBD1 – Engine Trouble Code Information For Honda 95 & Earlier Models

OBD Codes – The Check Engine Light Is Only The Messenger


OBD1 Code History

Several automakers introduced computer interfaces for their own cars before the 1990s. But, the push to standardize didn’t begin until 1991. Consequently, when the California Air Resources Board (CARB) mandated that all cars sold in California; needed some form of capability. However, CARB didn’t issue standards for the systems until 1994.

So, Virtually every new car sold in the U.S. over; the past 20 years follows this standard. Cars have a OBD port, usually located; under the dashboard on the driver’s side; that devices can plug into and connect to a car’s computer.

The trouble engine codes are just that, though: Codes. Instead of a diagnosis like “loose gas cap,” you will see a string of letters and numbers; that is incomprehensible without a reference. Trouble codes start with a letter; and include four or five numbers; which together point to the specific subsystem; and what problem it is experiencing.

How To Read OBD1 Codes

  1. Always connect a car battery charger; to your car when doing any electrical work; that requires the ignition to be on. Low voltage can cause a lot of trouble with the troubleshooting; and a lot of error codes that we do not want.
  2. Put a jumper wire between PIN A and PIN B.
  3. Let the jumper wire sit there; and turn the ignition to ON. Do not start the engine.
  4. The check engine light will begin to flash. Count the flashes. There will be a longer pause between the codes; if you have several trouble codes and; a shorter pause between the digits of the trouble codes. For example, code 16 = 1 flash * Pause * 6 flashes.
  5. When all trouble codes are outputted; it will flash the code 12 – 1 flash * Pause * 2 flashes.
  6. Write down all the trouble code numbers you got; and check the trouble code table further down in the article.
  7. Finally, Remove the jumper wire and car battery charger.

Thank You !