Nissan Engine Management

[stokerpop]

2001 Nissan GU 4.8 Patrol
Engine managemrnt light on, loss of accellaration and top end power.
Has gone off when changing "gears" however this sometimes works but not always. Must turn off motor to reset.
Any help appreciatted?
Stokerpop

[coxy321]

Sounds like you either need to get it scanned, or run a manual coded diagnostics test on it (not sure if this is available on the GU's).

[stokerpop]

Thanks,
Think you are spot on,
Stokerpop

[coxy321]

Have you had a check over the car for any loose signal wires or connectors? Has anything else obvious changed on the car at the same time (fuel consumption, any electronic accessories)?

Sometimes the engine fault light can be triggered by the most minor things.

[gq banger]

There was a fault with the earlier TB48 that caused the engine to go into limp home mode that required both of the O2 sensors to be replaced & the ecu reprogrammed. It was a fairly common fault but I cant remember off the top of my head the code that was logged as it has been a while since I have had to do this.
Terry

[stokerpop]

Thankyou all, was a O2 problem setting off the code,
Stokerpop

[IN24BZ]

as previously stated 02 sensor , Electronic throttle models... remove both o2 sensors , cleans threads on them both and re install and disconect battery , you can replace the dear as posion sensors but cleaning them can work just as well... dont damage the sensor but.

[BowTieGQ]

Why does cleaning the threads fix the problem? Earthing?

[gq banger]

Yes it is an earthing problem, But just cleaning the threads tends to make them corrode more reguarly. There is also an ECU reprogramme that should be done that will stop the problem from reoccurring again.
Terry