O2 sensor bank1 sensor 2 -which is it?

Poggit · 17th August 2015, 12:52

Could any wise guru please tell me if the above fault location is the up stream or the down stream lamda sensor( ie before or after the cat) ?

T-Cut · 17th August 2015, 14:12

On a 1.8, it's the post catalyst one.
What fault message do you see?
The catalyst is more prone to fail than the lambda.

TC

BigRuss · 17th August 2015, 19:06

If it's an 04 or later car the fault code can be a bit a red herring depending on if the car has had the proper later ecu updates applied ;-)
Fault codes read on generic diagnostics sometimes are different to the manufacturers codes.
There was a problem with the earlier engine tune that caused error codes to show up reporting lambda problems that may cause damage to the cat.
Many cars have not had the updated tune applied even if they've supposedly been serviced by a main dealer ;-)

With the updated tune this fault disappears ;-)

What are you using to read them? ;-)

Russ

Poggit · 17th August 2015, 22:09

Double post sorry!

Poggit · 17th August 2015, 22:11

I'm using one of those cheap obd readers off the bay. It's main use is to Bluetooth coolant temp to a mobile!phone display I have rigged up on a permanent basis utilising the torque pro obd app, but it is also useful as a fault code reader and clearer.
I recently replaced the cat but also fitted a new secondhand o2 sensor downstream of the cat as the wiring on the original was quite fragile.
In the last 1500 miles the engine warning light has come on three times, each time the same fault and the same sensor.
Russ-the car in question is an 04 plate 1.8 and was bought off Marinabrian so I guess the ECU was suitabley up to date if its possible to do this on a T4?.
Problem here is that two variables were introduced at once: the new s/h sensor and a new cat.
T cut- immsorry but I can't give the exact read out as I have now cleared the fault! Will keep a note next time it occurs.
I am rather leaning towards it being the replacement sensor. Maybe I should get the soldering iron out and repair the original one and stickmthat back on?

T-Cut · 17th August 2015, 22:34

I was just going to say that lambda faults can be due to the catalyst failing, but seems not so in this case.

TC

moffat666 · 23rd August 2015, 05:44

had same fault on 2.5 V6, it was water in the connecting plug for the sensor , a quick blow with a airline / wd40, erased fault code, job done, JOHN.

17th August 2015, 12:52	#1
Poggit Gets stuck in Nissan Leaf Join Date: Sep 2012 Location: Lancashire Posts: 581 Thanks: 88 Thanked 66 Times in 57 Posts	O2 sensor bank1 sensor 2 -which is it? Could any wise guru please tell me if the above fault location is the up stream or the down stream lamda sensor( ie before or after the cat) ? __________________ *Love my electric car but miss my 75*

17th August 2015, 19:06	#3
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,417 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	If it's an 04 or later car the fault code can be a bit a red herring depending on if the car has had the proper later ecu updates applied ;-) Fault codes read on generic diagnostics sometimes are different to the manufacturers codes. There was a problem with the earlier engine tune that caused error codes to show up reporting lambda problems that may cause damage to the cat. Many cars have not had the updated tune applied even if they've supposedly been serviced by a main dealer ;-) With the updated tune this fault disappears ;-) What are you using to read them? ;-) Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and "160", Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.

17th August 2015, 22:09	#4
Poggit Gets stuck in Nissan Leaf Join Date: Sep 2012 Location: Lancashire Posts: 581 Thanks: 88 Thanked 66 Times in 57 Posts	Double post sorry! __________________ *Love my electric car but miss my 75* Last edited by Poggit; 17th August 2015 at 22:14..

17th August 2015, 22:11	#5
Poggit Gets stuck in Nissan Leaf Join Date: Sep 2012 Location: Lancashire Posts: 581 Thanks: 88 Thanked 66 Times in 57 Posts	I'm using one of those cheap obd readers off the bay. It's main use is to Bluetooth coolant temp to a mobile!phone display I have rigged up on a permanent basis utilising the torque pro obd app, but it is also useful as a fault code reader and clearer. I recently replaced the cat but also fitted a new secondhand o2 sensor downstream of the cat as the wiring on the original was quite fragile. In the last 1500 miles the engine warning light has come on three times, each time the same fault and the same sensor. Russ-the car in question is an 04 plate 1.8 and was bought off Marinabrian so I guess the ECU was suitabley up to date if its possible to do this on a T4?. Problem here is that two variables were introduced at once: the new s/h sensor and a new cat. T cut- immsorry but I can't give the exact read out as I have now cleared the fault! Will keep a note next time it occurs. I am rather leaning towards it being the replacement sensor. Maybe I should get the soldering iron out and repair the original one and stickmthat back on? __________________ *Love my electric car but miss my 75*

17th August 2015, 14:12	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,754 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	On a 1.8, it's the post catalyst one. What fault message do you see? The catalyst is more prone to fail than the lambda. TC

17th August 2015, 22:34	#6
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,754 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	I was just going to say that lambda faults can be due to the catalyst failing, but seems not so in this case. TC

23rd August 2015, 05:44	#7
moffat666 Newbie rover 75 saloon Join Date: Jan 2014 Location: stonehouse Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts	had same fault on 2.5 V6, it was water in the connecting plug for the sensor , a quick blow with a airline / wd40, erased fault code, job done, JOHN.