I asked the question..."I have a 2003 dodge ram 1500 4x4 with the 4.7L engine. The check eng light is on. obd2 reads code P 0038 And says HO2S Heater Control Circuit High (Bank 1, Sensor 2). the heater is not working. How do I fix this?"... I apreciate the answer. But Does this have to do with the heater in the truck not geting hot? As in no hot air, only cold blows in cab. Its a 2003

The intermittent fault, might have raised a fault code which will be be stored in the memory of the brain. If the problem is likely to affect the exhaust emissions it should be possible to read it with a generic obd2 code reader or scanner but otherwise dealer level equipment will be needed.

The DTC P0031 Heated Oxygen Sensor (HO2S) Heater Control Circuit Low Voltage Sensor 1 diagnostic monitors the operation of the HO2S 1 heater circuit. The heaters in the oxygen sensors increase the amount of time the sensor spends in Closed Loop fuel control operation or catalyst monitoring operation. The oxygen sensor heater greatly reduces the amount of time required for the fuel control HO2S 1 to become active. The heater helps provide accurate oxygen content readings of the engine exhaust by the HO2S.

code p 0058 refers to heated oxygen sensor (HO2S) 2 bank 2-heater control--circuit high === causes --wiring short to positive ---HO2S--ECM
for your previous post code p 0038 refers ti the HO2S 2 bank 1 heater control circuit high ===the causes are the same

Hello
When the service engine soon light a yellow light (Also called the check engine light or engine management light) is turned on this is to alert you to the fact that Powertrain Control Module (computer) has detected a failure somewhere in the systems it controls you may not feel any difference in the way the engine runs, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.

code mp 0038 refers to heated oxygen sensor (HO2S) 2 bank 1--heater control -circuit high====causes --wiring short to positive ---HO2S ---ECM
replace the sensor
it is in the exhaust pipe /manifold before the cat converter

check spark plug and ignition wire on #3 cylinder (count from front of engine. If plug and wire good, do compression test.

Your truck is OBD2 compliant take it to a local auto parts store and have them read the code for you they usually do this as a free service, if it doesn't have a obd2 port then your truck is not a 1996 vehicle.

u need a vacuum chec-thats a common thing and it doesnt show on a scan-may also hav to inspec sensor--go to a parts place n get a repair manual-it explains how to perform chec

well if truck running hot change thermostat

if it is doent seam to run hot go to salvage yard and remove sensor and place in pocket one home put replacemnt sensor in truck and reset computer it might be a computer samety feature but likely the heat sensor problem is tied to your heat

Hello,
P0031 - Bank 1 Heated Oxygen Sensor No. 1 Heater Circuit - Low Voltage. That is what this code means.
DTC P0031 is set when Bank 1 HO2S No.1 heater current is less then .09 amps, or potential difference between heater positive and negative terminals is more then 13.99 volts while HO2S heater is on. MIL (The engine light) is illuminated when Engine Control Module (ECM) detects malfunction during 2 consecutive drive cycles.
Possible Causes are: - Bank 1 HO2S No. 1 heater circuit malfunction - Bank 1 HO2S No. 1 heater malfunction - ECM malfunction - HO2S heater relay

DTC Confirmation Test (Advanced/Intermediate Users): Ensure intake air tempature is 18f (-8c) or more, engine coolant tempature is 18-230f (-8-110c) and vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition off, connect scan tool and turn ignotion on. Using scan tool, clear DTCs. Start engine and run at idle speed for 5 minutes. Using scan tool check for current or pending DTC P0031.

Diagnosis & Repair Procedure (Advanced/Intermediate Users): 1. If engine system check has been performed, go to the next step. If engine system check has not been performed, do the system check.
2. Turn ignition off. Disconnect Bank 1 HO2S No. 1 4-pin harness connector. Bank 1 HO2S No. 1 is located in the left exhause pipe before catalytic convertor. Measure resistance between Bank 1 HO2S No. 1 pigtail connector terminal No. 3 (Green wire) and No. 4 (Blue wire). Resistance should be 5.0-6.4 ohms at 68f (20c). If resistance is as specified, go to next step. If resistence is not as specified, replace HO2S. After repair repeat DTC Confirmation Test (Above).
3. Disconnect HO2S heater relay. HO2S heater relay is located on the left fender well. Turn ignition On. Measure voltage between ground and HO2S heater relay socket cavity No. 3 (Black/White wire). Also measure voltage between ground and HO2S heater relay socket cavity No. 1 (Blue/White wire). If voltage readings at both measurements is 10-14 voltes, go to step 5. If voltage readings are not as specified go to next step.
4. Check for blown HO2S (15-amp) or IG COIL (20-amp) fuses. Fufses are located in the underhood fuse and relay boxc. If fuses are okay, check for open or short it to ground in Black/White wire between IG COIL fuse HO2S heater relay. If problem is found repair as necessary. After repair repeat DTC Confirmation Test (Above).
5. Turn Ignition off. Install HO2S heater relay. Dicsonnect ECM 30-pin harness connector C51-2. ECM is located under instrument panel, under glove box. Measure voltage between ground and ECM harness connector C51-2 terminal No. 4 (Green wire). If voltage reading is 10-14 volts, subsitute a known-good ECM, and repeat DTC Confirmation Test (Above). If DTC does not reset, testing is complete. If voltage readings are not specified, go to next step.
6. Check for short to ground in Green wire between Bank 1 HO2S No. 1 and ECM. If no problem with wiring is found, replace HO2S heater relay. If problem persists after repairs, subsitute a known-good ECM and repeat DTC Confirmation Test (Above).

I hope this helps and is what your looking for. Best of luck.