Bank 1 is always the same side of the motor as the number one cylinder. Bank two is the other side.
Sensor 1 is always before the cat. Sensor 2 is always after the cat.
Since that year only has one O2 before the cat it would be called bank1 sensor 1. It is located before the cat in the exhaust manifold on the back side of the engine (firewall side).
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SOURCE: o2 sensor where are they located
the 1996 grand only used 2 02 sensors on the 2 engine options.....the 5.2 v8 sensors are located 1 just in front of the convertor and the downstream is in the convertor....the 4.0l the downstream is in the convertor and the upstream is located in the exhaust manifold right under the intake manifold.
SOURCE: more 99 cougar problems
there is a fuse for the o2 heaters if one of the sensors blew the fuse they will all be out
SOURCE: obd code P0135 on a lexus ls400
usually your first sensor is located on the exhaust manifold
SOURCE: Where is bank1 sensor 1 (O2 sensor) of 2003 Mitsubishi Eclipse
if its a 4 cylinder it will the 02 sensor closest or if not in the exhaust manifold
SOURCE: 2001 Olds Alero oxygen sensor bank 1 P0135
p0135 indicates bank 1 sensor 1 which is before the cat.
P0134....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135....O2 Sensor Heater Circuit (Bank 1 Sensor 1) heater in the O2 sensor has packed up first sensor before the cat
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