I can't seem to find a direct answer to this question, or perhaps not asked properly. I'm looking to identify Bank # and Sensor # for the 4 O2 sensors.
(I've located all 4 sensors)
2008 XL-7 Limited, 6 Cylinders 3.6L MFI DOHC
I believe Bank 1 sensors are PRE catalytic converter and Bank 2 are POST converter. Can this be confirmed?
What I DON'T have a handle on is Sensor ONE vs Sensor TWO.
Are Sensors one in the FRONT of the engine or the rear?
It looks like you are using a real time scanner to look at the oxigen sensors cycles.
If you can't identify them, simply unplug one at a time and look at your scanner, if it's not cycling you can identify it.
THANK YOU....I'm not using a real time scanner, but your protocol would work . Actually feel kinda stupid for not thinking of it, guess its been too long since I've worked on my car and troubleshooting skills are rusty!
Bank 1 & 2 refer to the two banks of cylinders, sensor 1 & 2 refer to the position of the sensor relative to the catalytic converter - sensor 1 is pre-cat, sensor 2 is post-cat.
On the earlier H-series V6 engines (2.0, 2.5 & 2.7) bank 1 was the left bank, bank 2 was the right - I've never looked at the 3.6 so I don't know which is which, but you can identify it by looking to see which bank is closest to the front of the engine - one bank will be an inch or two further forward than the other.
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I can't seem to find a direct answer to this question, or perhaps not asked properly. I'm looking to identify Bank # and Sensor # for the 4 O2 sensors.
(I've located all 4 sensors)
2008 XL-7 Limited, 6 Cylinders 3.6L MFI DOHC
I believe Bank 1 sensors are PRE catalytic converter and Bank 2 are POST converter. Can this be confirmed?
What I DON'T have a handle on is Sensor ONE vs Sensor TWO.
Are Sensors one in the FRONT of the engine or the rear?
Thank you!
RESOLVED (Thanks all!!)
Standing in FRONT of the vehicle, BANK 2 is the front 2 or closest sensors, Sensor 1 is PRE catalytic converter and Sensor 2 is after the CC.
BANK 1 is the far side or closest to the Driver, Sensor 1 is PRE catalytic converter and Sensor 2 is after the CC.
Will a scanner code identify which sensor is bad? Tech at shady dealership told me "bank one, rear" replaced it ( bank one downstream) but CE light still on. Haven't gotten codes pulled yet. 08 xl7, got a bosch sensor.
Last edited by Broomall Bob; 05-15-2012 at 05:37 PM.
Reason: additional info
Bank 1 Rear, or downstream would be Bank 1 sensor 2, or on the driver's side of the engine, underneath and after the Cat Conv. a relative EASY replacement, in fact ALL are easy replacements with the exception of Bank 1, sensor 1, nestled down deep by the firewall, a BITCH to get to. But yes, a code checker WILL indicate the senor and bank
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Oxygen Sensors once and for all
Linear Mode
