For those who don't know, I recently did a head gasket replacement on the rover, 2nd try worked out great but the first one was blowing coolant into the exhaust and creating a lot of steam so I think it might have ruined all my O2 sensors (it ran for about 1 mile and idled for 30 minutes while I tried to trouble shoot the problem the 1st time)

I'm now getting these codes :

P0141 : 02 sensor heater circuit bank 1 sensor 2
P0150 : 02 sensor heater circuit bank 2 sensor 1
P0140 : 02 sensor no activity bank 1 sensor 2
P0139 : 02 sensor slow response bank 1 sensor 2
P0174 : system to lean bank 2
P0161 : 02 sensor heater circuit bank 2 sensor 2
P0159 : 02 circuit slow response bank 2 sensor 2

Also when I dropped the "Y" pipe the connector for the front sensor on the passenger side was yanked and I did my best to put the pins back in the right place.

Should I just go ahead and replace all 4 sensors?

 

02 sensors hate silicone, but you do a lean mixture bank 2 fault Buy one replace and see if that fault goes away.

 

I don't quite follow?

 

Buy one 02 sensor that has a fault code for it. Install it, clear all fault codes. Test drive vehicle and see if that fault code comes back. It would be nice to check live data for fuel trim too see if it is in negative taking fuel away not adding like it has a vacuum leak. You did have a lean mixture code also. I don't want to purchase four 02 sensors for no reason, but if there are old change them.

 

There might be a vacuum leak... which side of the motor is bank 2?

 

Driver side

 

Oh. Hm . On the sai adapters are you supposed to you any thread sealer ?

 

If the o2 sensors where giving the wrong readings, would the engine run poorly? At idle it seems to run very rough if I'm not giving it extra gas

 

How many miles on the engine, when was it last tuned along with plug wires?
If you are at 100,000 miles switch out all 4 02's, clear the codes and see what is left if anything.

 

Bank 2 is the right side, correct? So passenger side for all of us Americans...