For 1990-2009 cars

# ECM APPLICATION CHANGE NEW ECM PART NUMBER

#### Models Affected: Some 1985 Rivieras Equipped with 5.0L Engine (Vin Code Y)

A change was made in the ECM application used with the 5.0L V-8 engine (VIN Code Y) in some 1985 Buick Rivieras. The diagnostics for both units remains the same; however, the ECMs are not interchangeable. The second type ECM, part number 1227076 replaces the first type ECM, part number 1226866 on Buick Rivieras built after serial number FE431276.

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