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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Catalytic Converter glowing hot?

If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.


The details are as follows :-----
You probably have a large vacuum leak. Catalytic converters can only glow hot if they are getting too much fuel and too much oxygen (or air). A vacuum leak will put way too much oxygen in the exhaust and will cause the oxygen sensors to read lean. Then the computer will start adding a bunch of fuel to try and compensate for the lean oxygen sensors.
You may be able to find the Vacuum leak by using an old spray bottle and using plain water to mist the seams of the upper engine and any Vacuum lines that you see.
When the water is drawn into the leak on a running engine, your RPM will drop or the engine will stall. Some mechanics use choke cleaner to do this test, but choke cleaner is combustible, can damage your cars' paint, and can melt certain plastic parts. The safer fluid is water.

The details mentioned above will help.Thanks.

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