2002 Mazda MPV: Heater Low Circuit?

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:----




This details will help.
Thanks.

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