2003 Check Engine Light code: P0031 - Toyota Nation Forum : Toyota Car and Truck Forums

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post #1 of 24 Old 03-03-2008, 06:06 PM Thread Starter
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2003 Check Engine Light code: P0031

I own a 2003 Camry LE. I went to Autozone to find out what the check enginge light was for and was given P0031. When the service person checked it out on the computer he said the probable causes were:

1) open or short circuit conditions
2) poor electrical connections
3) failed oxygen sensor
4) EFI relay fault.

I asked how it could be narrowed down and he said it I would have to get the car checked out. I know it's a long shot, but would anyone know by chance which one of these it would most likely be and perhaps a guesstimate about how much something like this would cost to fix? I would like to have some type of an idea when I take my car to get fixed somewhere.
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post #2 of 24 Old 03-03-2008, 06:16 PM
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Its a failure of the Heter control circuit for the bank 1 sensor 1 Air/Fuel sensor.

Assuming you have a 4-cylinder, Your engine is a 2AZ-FE

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post #3 of 24 Old 03-03-2008, 06:19 PM
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DTC P0031 OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)

CIRCUIT DESCRIPTION



DTC Detecting Condition

HINT:
This DTC is recorded when A/F sensor is in a malfunction, although the caption is oxygen sensor.

To obtain a high purification rate of the CO, HC and NOx components of the exhaust gas, a three-way catalytic converter is used. But, for the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio.

The A/F sensor has a characteristic of providing output voltage* approximately proportional to the existing air-fuel ratio. The A/F sensor output voltage* is used to provide feedback for the ECM to control the air-fuel ratio.

By the A/F sensor output, the ECM can determine the deviation amount from the stoichiometric air-fuel ratio and control the proper injection time immediately. If the A/F sensor is malfunctioning, ECM is unable to perform the accurate air-fuel ratio control.

The A/F sensor is equipped with a heater which heats the zirconia element. The heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), current flows to the heater to heat the sensor for the accurate oxygen concentration detection.

*: The voltage value changes at the inside of the ECM only.

HINT:
This DTC is recorded when A/F sensor is in a malfunction, although the caption is oxygen sensor.

The ECM provides a pulse width modulated control circuit to adjust current through the heater. The A/F ratio sensor heater circuit uses a relay on the B+ side of the circuit.

Sensor 1 refers to the sensor closest to the engine body.

Wiring Diagram

Step 1 - 2
Step 3
INSPECTION PROCEDURE

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

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post #4 of 24 Old 03-04-2008, 02:33 PM Thread Starter
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Would I be able to replace this O2 sensor, or is it something that I'll have to done at a repair shop? And since my car is still under 80,000 miles would this be covered by the Federal Emissions Warranty?
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post #5 of 24 Old 03-04-2008, 03:48 PM
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Gen5

If you are smart enough to perform the above posted diagnostics, you're smart enough to screw in a new sensor, plug it in, and clear the code.

No, it's not under the Federal Emissions Warranty. The ECM and catalytic convertor are though.


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post #6 of 24 Old 03-04-2008, 04:00 PM
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Gen6

I don't know about that, TRD.

Sensors used in Air/Fuel Metering, Air Induction, Catalyst System, Evaporative Control System, EGR system, Ignition System and PCV system are covered for 8/80.
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post #7 of 24 Old 03-04-2008, 04:07 PM
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Wrong.

Actually, the primary purpose of the Bank 1 O2 sensor isn't for emissions, so it would not be covered under the 8/80 emissions warranty.

Here's the link: http://epa.gov/obd/warranties.htm

EDIT: The way I stated my previous response wasn't inclusive of the 2 year or 24,000 mile federal emissions warranty. Nobody cares about it because those componants are covered under Toyota's 3 year or 36,000 mile basic warranty anyways.

You did have me second guessing myself though.


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post #8 of 24 Old 03-04-2008, 04:19 PM
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Gen6

I used my "Camry Owner's Warranty Information" Manual.

The O2 sensors are part of the Air/Fuel Metering System, I believe.
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post #9 of 24 Old 03-04-2008, 04:23 PM
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Yes, they are. The link I posted explains everything perfectly.

By the way, you don't disagree like most people. Aren't you supposed to start name calling or something?


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post #10 of 24 Old 03-04-2008, 04:33 PM
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Gen6

No, that's for the infantile forum posters who still are stuck in the 4th grade.
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post #11 of 24 Old 03-04-2008, 04:40 PM Thread Starter
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Thank you for all the info . It is doubtful that I can change this on my own. Anyone have an idea on how much it would normally cost to get the O2 sensor replaced at a repair shop? I would just like to have a ballpark figure before I take it in somewhere. I really don't know much about the cost of vehicle repairs.
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post #12 of 24 Old 03-04-2008, 04:56 PM
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Gen6

Take it to your dealer. It's under the 8/80 warranty.
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post #13 of 24 Old 03-04-2008, 05:15 PM
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No it's not. It's not a specified componant.

It's emission control or emission related.



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post #14 of 24 Old 03-04-2008, 05:24 PM
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Gen6

"In the future, there may be other parts or components that qualify for this coverage. Check your owner's manual or warranty book for possible additional coverage."

I read the fine print......

It's specified in my 2007 Camry Warranty Book!!!!!!!

Page 15 and 16.

Maybe it was different in the 2003 manual but I doubt it.

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post #15 of 24 Old 03-04-2008, 05:30 PM Thread Starter
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Can we please not let this become a flame? Obviously there is a difference of opinion about whether this is covered by the Federal Emissions Warranty. If it is covered great. If not I would like to know if any has a ballpark figure as to what it would cost to replace the sensor?
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