schematics and diagrams: faulty o2 sensor

Error code P0037, H025, BANK 1 SENSOR 2, HEATER CIRCUIT LOW.

This is the O2 sensor located behind the Cat on the back side of the engine exhaust manifold.

To determine if the heater is bad, a resistance reading can be made on the heater pins at the plug to the O2. These would be the connectors that the Light Green and Black/White wire on the engine harness connect too. There should be resistance of 14.2 to 18.9 ohms. Anything more or less of these values, replace the O2.

And in case of P0031, HO2S Bank 1 Sen 1
Heater Circuit Low
The firewall side of the engine is Bank 1 for the MPV, the radiator side is Bank 2. So that code is pointing to a problem in the heater circuit for the sensor near the firewall before the convertor. You can check resistance of the heater circuit of the sensor. If should have 5-7 ohms, if not then the sensor is definitely bad.

AND IN CASE OF
P0031 H02S BANK 1 SEN 1, HEATER CIRCUIT LOW, WHERE IS THIS SENSOR LOCATED AND IS IT UPSTREAM OR DOWNSTREAM.

THe Oxygen Sensor at Bank1 Sensor1 is mounted to the exhaust manifold on the side of the engine closest to the firewall. This is a "Sensor 1" so it is labeled as an "Upstream" sensor.

See the help diagram shown below:----

Mazda Sensor parts location

This details will help.
Thanks.

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O2 sensor gets faulty,there are many indications.But first the fault code has to be tested.Is there check engine light on dash.Did you got bad O2 sensor error code in car scan.
An O2 sensor that is not functioning correctly or is reading a lean or rich fuel mixture turn on the check engine light in the dash, this is an Orange indicator. There are other reasons like the heater circuit in the O2 is defective, that is a different code. On this car you can read the signal out of the O2's using a special tool called a scanner, it plugs into the diagnostic port under the dash in front of the driver.So first get this confirmed,before directly confirming,that O2 sensor is bad.

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This will help.Thanks.

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