Numbers on the part are for the supplier's use. Sometimes they will print the car manufacturer's part number on it if requested to do so, but that isn't done all the time. We go by application, then find part numbers at the dealership if we need them.
If this is a relay you're looking at, you're going to find many of them on the car with the same number. At most you might be able to say a certain number is used for a certain application, but it won't be the only application. You're likely to find the AC compressor relay, fuel pump relay, and starter relay can all have the same markings.
Omron is popular manufacturer of relays and they do supply some of their products to the automotive industry. "MR" numbers followed by six digits are Mitsubishi part numbers. Any other numbers on the part could refer to a batch number or plant number. Those are only used by the manufacturer of the part to identify when and where it was made. If a defect in manufacturing is found that could apply to the entire batch, that can be used in a recall to identify whether a part needs to be replaced or can remain in service.
Some parts have multiple part numbers because it is used by multiple manufacturers. For example, in the late '90s a turn signal switch for a Dodge Caravan had their part number, a Toyota part number, and a third part number printed on it. That was a model-specific part. Relays are pretty generic and you're going to find the same part in a lot of other car brands and models. You can even find relays made by different manufacturers will work in your car.
Friday, October 23rd, 2015 AT 7:17 PM