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Passenger side, before the cat. Bank 1 is the drivers side, Bank 2 is the passenger side. Sensor 1 is upstrem, before the cat, sensor 2 is downstream, after the cat.
the cold from hell,,
CAT monitor. know it well, too well.
no its not that.
the code tells that engine has a lazy or dead cat.
no engine stated.
its and XL-7 not and XL7, they are different cars.
3.6L V6
bank one is failing the person who told you bank 2 is full of beans.
"Catalyst Efficiency Below Normal (Bank 1)" SM quote.
we change the front B1S1 front sensor first.
then the B1S2, sensor next.
then the CAT if sure no exhaust leaks are on Bank1.
S1 is front
S2 is rear
bank 1, is cylinder 1 side
bank 1 is,, right bank, usa is passenger side
look for leaks first in exhuast
then bad 02s, on right side , damage to wires.
the new sensors.
then new cat, $$$$$$$$$$$$$$$$$$$ last
O2 sensor bank 1 sensor 1 same side as cylinder 1 the sensor before the cat. If engine is facing forward, belts in front it would be on the passenger side. If engine is sideways belts on passenger side, the sensor would be by firewall before cat.
O2 sensors are always after the cat converter and HO2S sensors are always before the cat converter.
p0135 refers to heated oxygen sensor(HO2S) 1 bank 1-heater control--circuit malfunction
If it is a straight 6 cylinder engine with 2 cat converters it will be the sensor before the cat converter that connects to the manifold from pistons 1.2.3
If it is a V6 it will be the sensor that is in front of the cat converter that connects to the rear bank pistons 1.2.3. Use the special socket when removing/replacing the sensors to prevent wiring damage
the banks of a v engine are determined from the drivers seat in a convention car and in a east-west car the no 1 bank is closest to the firewall so from the drivers seat no 1 bank will be in front of the driver ( LH drive cars) or in front of the passenger in RH drive cars
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).
bank 1 on a chevy is on the drivers side youll have 4 O2 sensors sensor 1 bank 1 is on the engine side of the cat converter sensor 2 bank 1 is after the cat converter (drivers side )
bank 2 is on the passenger side sensor 1 is pre cat sensor 2 is post cat converter
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2
some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2
Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.
Sensor 1 is always the upstream sensor (The one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.
Most GM engines have #1 cylinder located on the left bank, (or Driver's Side) of the engine,
So, the answer to your question would be that you are looking for the sensor located before the catalytic converter on the right (or Passenger Side) of the truck.
if you look at the front of the motor you will notice one cyclinder is further forward then the other... that first cyclinder would be 1. i'm guessing the side opposite to cyclinder one would be bank two.
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