Lamda o2 sensors 2.0 V6 identification help

t5tart · 31st May 2013, 15:51

ok so I have plugged into the diagnostic and thought I would have a look at live data

noticed that bank 2 o2 sensor is nice and stable but bank 1 is all over the place.. maybe its failing?

might be why it almost failed emissions last mot

can anyone help with identifying which sensor is which and where the connectors are ?

I want to try unplugging them individually

I am assuming bank 1 will be 1,3,5 and the front manifold sensor?
bank 2 2,4,6 and the rear manifold?

and then there is a post cat one I think on the exhaust?

t5tart · 31st May 2013, 17:08

a little confused

unplugged the front lamda sensor .. (bank 1)

so I thought this would not show a zero voltage on the live data but its showing 0.4v same as the bank 2 sensor ... now this is odd to me
does this meant its the bank 2 sensor thats packed in although it fluctuates .05v

may have to check the back one is plugged in properly now after the engine swap .. as unplugging one has brought it into line with the other

I dont know a lot about these sensors
so any help on what they should be approx would be helpful

thanks

Dashiel · 31st May 2013, 19:38

Sounds like mine.
I read it as meaning lambda 1 being one of the 2 front v bank lambdas. This wildly fluctuates, this is normal and is between 0 and 1 volt. Lambda 2 is the post cat and this stays constant. Again which is normal as it checks the efficiency of the cat.
I think you may need a t4 to see all 3 lambda readings...
Or does anyone know otherwise?

t5tart · 1st June 2013, 01:40

Quote:

Originally Posted by Dashiel

Sounds like mine.
I read it as meaning lambda 1 being one of the 2 front v bank lambdas. This wildly fluctuates, this is normal and is between 0 and 1 volt. Lambda 2 is the post cat and this stays constant. Again which is normal as it checks the efficiency of the cat.
I think you may need a t4 to see all 3 lambda readings...
Or does anyone know otherwise?

I can see all 3
bank 1 sensor 1
bank 2 sensor 1
bank 2 sensor 2 ( which I assume is the post cat one )

Pike · 3rd June 2013, 22:04

Today I had the check engine light come on my ZT which was caused by a Lambda issue which turned out to be the wires having snapped off the sensor itself . My scanner gave a reading of .415v with a very slight fluctuation despite no sensor being connected to the wiring which would suggest that on your car the similar reading sensor is faulty or the wiring is damaged.

Bank 2 sensor 1 is on the downpipe from the rear cylinders, located near the rear lower engine mount

31st May 2013, 15:51	#1
t5tart Posted a thing or two MG ZT cdti Join Date: Jun 2010 Location: Northants / Bucks border Posts: 1,815 Thanks: 260 Thanked 204 Times in 182 Posts	Lamda o2 sensors 2.0 V6 identification help ok so I have plugged into the diagnostic and thought I would have a look at live data noticed that bank 2 o2 sensor is nice and stable but bank 1 is all over the place.. maybe its failing? might be why it almost failed emissions last mot can anyone help with identifying which sensor is which and where the connectors are ? I want to try unplugging them individually I am assuming bank 1 will be 1,3,5 and the front manifold sensor? bank 2 2,4,6 and the rear manifold? and then there is a post cat one I think on the exhaust?

31st May 2013, 17:08	#2
t5tart Posted a thing or two MG ZT cdti Join Date: Jun 2010 Location: Northants / Bucks border Posts: 1,815 Thanks: 260 Thanked 204 Times in 182 Posts	a little confused unplugged the front lamda sensor .. (bank 1) so I thought this would not show a zero voltage on the live data but its showing 0.4v same as the bank 2 sensor ... now this is odd to me does this meant its the bank 2 sensor thats packed in although it fluctuates .05v may have to check the back one is plugged in properly now after the engine swap .. as unplugging one has brought it into line with the other I dont know a lot about these sensors so any help on what they should be approx would be helpful thanks

31st May 2013, 19:38	#3
Dashiel Posted a thing or two Rover 75 V6 2.0 Club Tourer LPG Join Date: Apr 2011 Location: South East Posts: 1,405 Thanks: 3 Thanked 39 Times in 34 Posts	Sounds like mine. I read it as meaning lambda 1 being one of the 2 front v bank lambdas. This wildly fluctuates, this is normal and is between 0 and 1 volt. Lambda 2 is the post cat and this stays constant. Again which is normal as it checks the efficiency of the cat. I think you may need a t4 to see all 3 lambda readings... Or does anyone know otherwise?

3rd June 2013, 22:04	#5
Pike Regular poster MG ZT-T Join Date: Apr 2013 Location: Barton Le Clay, Bedfordshire. Posts: 57 Thanks: 0 Thanked 9 Times in 9 Posts	Today I had the check engine light come on my ZT which was caused by a Lambda issue which turned out to be the wires having snapped off the sensor itself . My scanner gave a reading of .415v with a very slight fluctuation despite no sensor being connected to the wiring which would suggest that on your car the similar reading sensor is faulty or the wiring is damaged. Bank 2 sensor 1 is on the downpipe from the rear cylinders, located near the rear lower engine mount