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.
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 06:37 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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