Obd2 code reads bad H02 heater control circuit bank1 sensor 2. how do I change it and where is it located on Cadillac Deville 2001
O2 sensors are on each side of a v engine before the catalytic converter and one aft if you have two converters then you will have two downstream. Usually the ones closest to the exhaust manifolds go first
Normally just replace the HO2S sensor using the correct tool for the job so as not to damage the wiring to the unit as it is wired directly to the ECM unit.
SOURCE: 2002 Cadillac Coolant sensor
The engine coolant temperature sensor is located on the driver side of the engine near the rear of the engine compartment
SOURCE: Were are the O2 oxygen sensors location on a 2001
hi im wesall o2 sensors are located in the exaust system yours has one before the converter one after if it has duall exaust before the cat on drivers side will be upstream sensor bank 1 after cat right side will be bank 2 sensor 2
thanks wes
ps please rate me
SOURCE: 1994 cadillac deville concours
On my car, which is the same as yours, it is located on the manifold top back left. Pictures in the book just show it on top.
SOURCE: 2001 Cadillac Deville TCC PWM Solenoid Circuit (p1860)
it should take approximately 4 - 5 hours plus the cost of sensor
SOURCE: 2001 cadillac deville, overheats without loss of coolant
First, provided their are no visible coolant leaks and/or loss of coolant with no signs of leaks, I would thoroughly flush cooling system and replace coolant, then check and/or replace thermostat (you can place thermostat in boiling water to check for proper function), if you have tried these 2 steps and still are experiencing overheating you may need to replace your water pump which can be a tricky job if you're unfamiliar and try to do it yourself, however, I could walk you through it if necessary. Also visually check your radiator hoses for bulges, wear ,etc along with heater hoses etc. You may want to also check radiator fins to see if they are dirty/obstructed and clean if necessary. Let me know if I can assist you further and how it works out
The
common fix for this code is to check the integrity of
the heater wires. Check the wires for insulation and routing
which could be loose or touching a hot exhaust that can
short the wires. If the engine has too many miles, it
is possible that the heater circuit inside is worn and
shorted which needs a replacement of the oxygen sensor.
If you have a DVOM, you can also test the continuity of
the heater wires from the oxygen sensor to your computer
pins.P0031....HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0052....HO2S Heater Control Circuit High (Bank 2 Sensor 1)
code 91 does not exist
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