While driving, the computer of your Civic (ECU o PCM) monitors air/fuel supply and exhaust gases in order to verify that the engine is working properly. If any problem is detected, the check engine Light of your dashboard will turn on. Depending on the type of failure, the light may either blink or remain constantly lit.
Step 2 – Identify the ECU type. Look on the side of the ECU to view its bar code label. This label contains the part number, which indicates what transmission, engine, and OBD scan tool the ECU is compatible with. All fifth and sixth generation Civic ECUs begin with a five digit number: 37820. The following three-digit alphanumeric code
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honda civic 1.7 cdti 2003