Nissan Patrol ECU Fault

Whoa, sounds familiar! I've got a Patrol too and had similar symptoms a while back. Reduced power is no fun. Did your diagnostics specifically call out the relay? The ECU's a pretty complex computer module, so before you start on the likely cause, double-check that the fault code really is coming from the ECU and that it really is the relay and not, say, a bad sensor giving the ECU bad data. Have you tried a system reset at all?

The diagnostics pointed to a fault within the ECU itself, hence the relay suspicion. A faulty relay, I believe, could cause the ECU to misbehave or throw errors. By system reset, do you mean disconnecting the battery or something more involved with car diagnostics?

Yeah, I meant the basic disconnect-the-battery trick. But if your diagnostics are already pointing at the ECU, and the car diagnostics says it's the relay, then I'd be careful and take it to a workshop. Automotive electronics are a pain. For me the issue was the ECU, after the relay got checked.

Appreciate the input. I traced it to the main relay as suspected. Replaced it, cleared the error memory, and all seems good now. Cost me 120€ all in for the part. Thanks again!