Relays E05, E07, and E08 are involved with the AC system, but be aware, the diagnostic fault code did not say to replace a relay. Fault codes never say to replace a part or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a part is referenced in a fault code, it is actually the cause of that code about half of the time. Before wasting your money on unneeded parts, professionals will check wiring and connector terminals for problems first, to rule out the other causes.
Also, there can be over a dozen fault codes related to one circuit, and they mean very different things. It's important to remember the code number(s), then you can go here:
https://www.2carpros.com/trouble_codes/obd2/p0400
to see the definitions, or I will be happy to interpret them for you. If we need to go further, please list the symptoms we're trying to solve.
Mar 25, 2019 at 6:24 PM
