Honda Accord/Prelude 1984-1995 Repair Guide

Engine Number


See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Common VIN, engine and transaxle number locations

The engine serial number is stamped into the right front side of the engine block. This number identifies the engine family, application and build sequence of the engine. The engine number should be used any time engine parts are purchased; many parts within engine families are unique to the family and not interchangeable with other engines.

For example, the engine number ES3-2900001 for a 1985 Accord, breaks down as follows:

ES3: Engine family, fuel injected
2: Model year (1985)
9: Emission group, 49 state and high-altitude
00001: Serial number or production number

Meanings of numbers change from model to model and year to year. It isn't necessary to know what each digit means as long as the complete number is available when buying parts. From 1987 on, engines use a 5 character family designation, such as B21A1 or A20A3.

In this book, when specific engines must be identified, we will use the family designation (all the characters before the dash in the engine number). In more general cases, we'll use the more everyday designations such as displacement and/or fuel and emission system. An example would refer to all fuel injected 2.0L engines or all 1.8L engines except California vehicles.