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Old 05-24-2015, 12:13 AM   #1
Scooby Newbie
Member#: 415861
Join Date: Mar 2015
Chapter/Region: International
Location: Brisbane
2009 WRX
Dark Grey

Default Rear O2 sensor before cat in after market dp - 2009 wrx

Recently installed an invidia q300 tbe and have had a flash tune to my 2009 wrx. The dp is an auspec invidia with has the cat right at the end and the o2 sensor bung located before the cat (supposed to improve flow and avoid interference with the steering knuckle in australian rhd vehicles).

I note the us spec dp, the stock dp and most other after market dps seem to be the other way around. Is there any problem with the sensor before the cat? Does this sensor affect afr and if so wouldnt this be thrown out as I would have thought there is a lot more o2 before the cat than after where i assume the ecu thinks its located?

Is this something the tuner can work around or is this problematic? All seems fine after my tune but I am just curious about whether there are any adverse impacts that might not have any obvious symptoms?
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