Sensor light on?

[RasselFlassel13]

Ok there probably aready a thread on this but I can't find it. I just got my second 720. My first 4x4 and efi. When I got it had two wires unplugged under the left side of dash I plugged them back in as the break lights weren't working. Didn't fix it so I had to rewire as a rat ate one of the wires. I started my truck and the sensor light came on and was running real bad. So I unplugged then and it when away. My question is it the o2 sensor dat has gonna bad

[datzenmike]

Found it. It reminds you to check or service your O₂ sensor. Without it, the ECU goes into 'limp home' mode or open loop. To prevent engine damage from a too lean mixture, it is purposely forced into a somewhat rich condition. Engine mileage will plummet without proper O₂ control.

 

 

 

OK
 
Here is what the sensor light means, how it operates and how to 'service' it.
 
 
by Mike Cieply:
 
The sensor light is a maintenance reminder. It is programmed to come on at 50k and 90k, at 60 k you are supposed to check  the 02 sensor and replace if needed, after that, there is a one wire connector (believe the wire is brown) under the cluster (below clock under the dash) you take it apart and swap it to the other one wire connector, it will go off until 90 k, check o2s again and replace if needed, then disconnect the connector entirely and the light will never return ( this is per the Nissan FSM)
 
 
My 76 710 a counter like an hour meter (so do similar year cars and trucks) on the pass side that sets off a warning lamp to remind you to clean and service your EGR valve.

 

Easy fix.

[flatcat19]

Nissan's way of saying "F*** you, round-eye"?

[RasselFlassel13]

Alright sweet thanks for all the help. I just didn't wanna have it to break down as I got it for Winter and its only 91000 mile and aready retorqued the head down to be safe

[la_leo]

Found it. It reminds you to check or service your O₂ sensor. Without it, the ECU goes into 'limp home' mode or open loop. To prevent engine damage from a too lean mixture, it is purposely forced into a somewhat rich condition. Engine mileage will plummet without proper O₂ control.

 

 

Easy fix.

is the green plug the sensor light reset?

[720_Jeff]

Green plug is for the clock, unless there is more than one green plug.

[la_leo]

That's the only wire I see under the dash then. Hmm. Guess I'll just live with the sensor light

[datzenmike]

According to my '84 FSM the SENSOR wire is a Green/Red stripe. There are two, 10 pin connectors under dash near steering column... Blue and a White one. Probably on the Blue one. Check first.