I have a 2002 Mazda Protege and have error code P0031 and indicates a Heater control circuit low. I need to know which one is it. Help

P0031 Heated oxygen sensor HO2S 1 bank 1 heater control circuit low...

P0037 HO2S Heater Control Circuit Low B1S2

https://www.obd-codes.com/p0031 Check for a fuse bing blown , Heater circuit shorted in O2 sensor blowing the fuse , maybe . You don't say what make , model an year vehicle an engine size .

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Definition of Diagnostic Trouble Code P1335 Audi: Engine Torque Monitoring 2 Control Limit Exceeded Buick: CKP Circuit Cadillac: CKP Circuit Chevrolet: CKP Circuit Ford: (EGR) Position Sensor Minimum Stop Performance GMC: CKP Circuit Infiniti: CKP Sensor (Ref) Jaguar: CKPS Circuit Malfunction Land Rover: Exhaust gas recirculation position sensor minimum stop performance. Lexus: Igniter Circuit Malfunction Bank 2 (During Engine Running) Lincoln: (EGR) Position Sensor Minimum Stop Performance Mazda: (EGR) Position Sensor Minimum Stop Performance Mercedes: CKP Sensor Circuit Malfunction, Bank 2 Mercury: (EGR) Position Sensor Minimum Stop Performance Oldsmobile: CKP Circuit Pontiac: CKP Circuit Saturn: CKP Circuit Toyota: No CKP Sensor Signal Engine Running Volkswagen: Engine Torque Monitoring 2 Control Limit Exceeded http://www.obd-codes.com/trouble_codes/nissan

Bad O2 sensor

here's a link sweet melissa, P0031 Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1

code P0031 - O2 B1 S1 heater circuit low. code P0037 - O2 B1 S2 heater circuit low.

Yes the O2 sensor preheater problem will turn on the VSC light, see the complaint often, why? don't know
.P0031 TOYOTA - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1
In most cases the O2 being replaced cures the code but here is the full story.
Possible causes- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit open shorted to ground
- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection
- Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit
- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit fuse
- Faulty Engine Control Module (ECM)

I can only help with the code,P0031=Shorted low condition detected in the oxygen sensor,1/1 heater element control feed back sense circuit.
Also a web site which gives the code breakdowns-www.wjjeeps.com/faultcodes.htm.

maori boy

This means an error has been detected by your engine management system. The next step is to pull the error codes from the computer and investigate those indications.

Trouble code P0031 means: Oxygen Sensor Heater Control Circuit Low - Bank 1 Sensor 1 .
Error code p0051:replace O2 sensor ($75-150 depending if OEM) before catalytic converter. need O2 socket ($10) to get at and tough to get to if vehicle isn't at least on a ramp.