ECU interchangable? Help!

[Dgadude]

hey so my 02 civic coupe AT needs an ECU. My question is, my ECU part # is 37820PLR439. I find so many from other identical civics with slightly different #'s, but are any of the interchangable or do i HAVE to use the exact same part number? Reason being is i'm not buying one brand new. Much appreciated thank you!!

[Xeryon]

Call a local dealer to confirm but it looks like 37820-PLR-439 ; 37820-PLR-L54; 37820-PLR-L55 are all compatible. 439 appears to be the least common but the l54 and l55 are much more common in the secondhand market. L57 would likely also work. Generally the three letters that make up the 6th, 7th, and 8th character in the part number are the relevant identification numbers. The numbers after that would be sub-versions of the ECU but wouldn't likely cause any change in operation. The sub-version maybe something as simple as date of manufacture, which supplier supplied the glue or if the housing was assembled with phillips or torx screws, that sort of thing.

 

37820-PLM-405 ; 37820-PLM-L05; 37820-PLM-L06; 37820-PLM-417 ; 37820-PLM-L03 are for a 02 MT DX model.

37820-PLM-L57 is a 03 version for AT LX models

37820-PLR-315 ; 37820-PLR-305; 37820-PLR-A02; 37820-PLR-A03; 37820-PLR-317 ; 37820-PLR-L01; 37820-PLR-L02 are for 01 MT EX models

 

And the list goes on. Here a link to a parts breakdown of 'Control Module' for your generation of vehicle. http://parts.sonshonda.com/showAssembly.aspx?ukey_assembly=279329&ukey_product=8678190

[Dgadude]

Xeryon, thank you very very very much for all the info! I know they're all for the same engine with (i believe) the exact same harness but i wondered if it would matter for additional things like airbags, sunroof, etc. I'll check it out. Thanks again, Sir!

[Xeryon]

Whether your car had a particular option or not won't matter provided you have the right three character code. The only real differences with ECUs has to do with the engine management (timing, fuel ratios and so on). If you were to swap engines in your car with a different model you would need the ECU that corresponded with the new engine, not the car.