Fault Codes

[Llewd]

Can anyone tell me what fault code 21 is. I have a 2004 4.2 diesel Patrol Thanks

[threedogs]

Hi mate didnt think a 4.2 had an ECU, anyway can you pop over
to the intros please just something the forum asks of us all.
No harm donee just polite and all.
Super Cheap Auto should be able to tell you