I have had my Rover for about 2 yrs and the last few months I have noticed a black soot ring on the tailpipe, what would the cause be... ? Maybe burning oil or excessive fuel?

I do have a bad O2 sensor (S1B1) which has been that way for a yr or more. Still trying to fault find, but my guess is bad wiring. As I tried the computer already. Any thoughts or help...

Cheers!

 

Most likely you are running a bit rich on fuel trim. Honestly most every Rover I have owned has had a bit of soot on the tail pipe though.

 

Do you have any other codes besides the o2?
Have you checked the fuel trims to see if they are way positive or negative? That's probably the best place to start to figure out what direction you need to go, if there is a problem.

 

No other codes just P0134... I'll check the trims to see what they are and report back (Have a NANOCOM).


Cheers!

 

Code does indicate you may have a wiring or sensor issue. Have you replaced or swapped sensor(s) and used meter to check circuit?
......

 

number9, yes swapped and changed with new ones as well. The S1B1 is always faulty. Indicates wiring or computer.


I will look at metering the wires again. Thanks for the help

 

You can try a bypass test to see if the signal wire is able to send a signal to the computer. Connect the scan tool and watch the data pid for the sensor. Back-probe the signal wire on the o2 sensor and touch one hand to battery positive and the other to the back-probe pin. It should max out the signal reading if everything is connected properly. The resistance through your body is more than enough to protect the circuit. Normally the reading has a maximum of 1.25 volts or so, but it could read higher. If it does go to the max reading, then you know that the sensor is at fault. If it doesn't, then you know the signal wire has a break in it somewhere, or the computer may be faulty.
To further test the circuit. You can do the same at the pin on the computer. You can run a jumper wire from battery positive to get closer to the computer. Then do the same, touch the wire with one hand and touch the back-probe pin in the computer connector. Then if you get a signal, you know there's an open somewhere in the wire.