Do you want to learn how to diagnose your check engine light on your older 1986 to 1993 Mercedes with the original OBD1 diagnostic panel? It is that little funny black box in your engine compartment with a cover on it. When you remove the cover, you'll see some push buttons and a bunch of numbers. This was the first generation of onboard diagnostics, and you will need to learn how to use this and read it properly if you're going to find out why your check engine light is on. Included here is a new OBD one flashing light reader with instructions on how to use it. You'll also receive the original Mercedes manual. It covers everything you need to know about OBD1. This is a very rare book that was delivered to the factory technicians when OBD1 was first introduced in the late 1980s. The manual in 259 pages in length.
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