View Full Version : O2 Sensors
demus82
02-27-2012, 10:47 AM
Hi fellas, quick question on 2 02 sensors. I got the codes of the odb and want to replace them. However, I did not know which sensor to buy based on upstream or downstream.
P0141(Bank 1, Sensor 2)- upstream or downstream?
P0155(Bank 2, Sensor 1)- upstream or downstream?
vr4gto
02-27-2012, 02:51 PM
Downstream is heated
http://www.evoscan.com/technical-vehicle-manuals/63-obdii-diagnostic-trouble-codes
demus82
02-27-2012, 03:55 PM
Cool, so from that list, both say (heater). This means downstream right?
vr4gto
02-27-2012, 04:38 PM
Yes, the heated O2 is downstream
Gotti
02-27-2012, 09:04 PM
4cly b1s2 is the p/s downstream. B2s1 is driver side upstream
V6 b1s2 is the rear exhaust manifold down stream. B2s1 is the front exhaust manifold upstream
huskerinaz
05-16-2012, 12:14 AM
deleted
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