Jeep 258 engine block casting number.
The casting number is 0331
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The engine number for a Mazda CX-9 Jeep can typically be found on the engine block itself. It is usually engraved or stamped onto a flat, machined surface on the engine block. You may need to look in the engine bay or underneath the vehicle to locate the engine number. It is a unique alphanumeric code that identifies the specific engine in your Mazda CX-9.
The one towards the front of the engine.
There is no 3.1 engine in any Jeep
Each year, engine, and transmission combination will have a different part number.
That is a little casting identification number in the cluster lense. It is not a malfunction indicator, just ignore it.
Right above the motor mounts on the 304 V8 engines there is a large casting mark that says 304.
JEEP xD