Question about 2003 Toyota Camry

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Code P0031 ...engine light on

How hard is it to replace an oxygen sensor in a 2003 Toyota Camry? We were quoted 414.70 Plus tax at our local Toyota dealer. Should we go ahead and have them do it? Which part number should I order if I do it myself?

Thanks alot for your input.

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  • tnelawyer Feb 25, 2009

    My "upstream o2 sensor" needs replacing and I was quoted $260 - looks like the part retails for around $200. $20 in Canada? Maybe the downstream...

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****; I have the same problem P0031 code (bank 1 sensor 1 ) I am told to replace the A/F sensor but I don't know which one front or rear and which brand is good; pl. advise

Posted on Feb 26, 2010

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Hi dandsdelvill, the sensor is quite easy to replace,it is a thread in nut configuration, they can be a little hard to bust loose but with a little elbow grease you can do it, is your car a 4 or 6 cyl? is it an LE,SE or XLE? there are 1-2-3 or 4 wire sensors the one wire being universal however I would suggest staying with the factory style you have whether 1-4. $414.70!!!!!!!!!!!!!!!!!!!!!!!!!!!!! well that beauty of a sensor here in Canada retails for between $20.00 to $120.00 if efi. Do it yourself my friend it is not difficult hope this helps good luck

Posted on Nov 11, 2008

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P0031


Hi Raul, You have a problem with the oxygen sensor or wiring on bank one. Regards John

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P0031 heater circuit problem


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2003 Lexus GS300 P0031 code


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
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What would cause all these 2004 toyota camry v6 3.0 P0031, P0102, P0113, P2237, P2238, P2252 and P0101 codes at the same time.


Have the following checked for proper operation: Mass Airflow sensor (its located on the air filter box), oxygen sensors. If ok, I would recommend having the wires checked for possible damage from rodents biting on them.

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I have a 04 sequoia and the codes p0031 and p0051 are coming up. How do I fix this?


Trouble code P0031 means: Oxygen Sensor Heater Control Circuit Low - Bank 1 Sensor 1 .
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1 Answer

05 COROLLA P0031


What does that mean? A P0031 DTC (diagnostic trouble code) refers to the O2 sensor (oxygen sensor) located on Bank 1 in front of the catalytic converter. There is also an oxygen sensor behind the converter which is Sensor #2.
This O2 sensor #1 may also be refered to as an air/fuel ratio sensor since on some vehicles it is. It detects the amount of oxygen in the exhaust gas compared to the outside air and then vehicle's computer adjusts the air/fuel ratio going into the engine. The sensor is less effective when the exhaust gas temperature is low, so it includes a heater which is activated to help get better readings from the A/F O2 sensor. Essentially this P0031 code means that the resistance of the heater circuit is lower than normal. In most cases, that resistance level must fall below 0.8 A to trigger the DTC code.
Note, this code is very similar in nature to P0032, P0051, and P0052

Potential Symptoms Most likely you'll not notice any symptoms other than the MIL (malfunction indicator lamp, a.k.a. the check engine light) will illuminate.
Causes A P0031 DTC trouble code may be caused by one or more of the following:
  • A short or open in the heater circuit in the sensor
  • A failed O2 sensor heater
  • Wiring/connectors broken/frayed leading to sensor and/or relay
  • Failed PCM/ECM
Possible Solutions Need an O2 Sensor? Visit our O2 Sensor shopping area for the lowest price on your replacement sensor!
To fix a P0031 DTC code, you'll need to do a proper diagnosis. To do that, you'll want to inspect the wiring and connectors leading to the sensor. Also if equipped with a heater relay and fuse, you'll want to check those as well. Use a digital volt ohm meter to:
  • check for 12 volts at the heater circuit feed (hint: unplug the sensor and check at the wiring connector to do this measurement)
  • check the ground circuit for continuity
  • measure the resistance of the heater circuit (done on the sensor itself)
  • measure the resistance and voltage of the wiring
Refer to a service manual for the correct specifications (volts, ohms) for your vehicle. On some Toyota vehicles this code is triggered when the resistance of the heater circuit is below 0.8 A.
With that said, a common fix for this DTC is to replace the air/fuel (O2 oxygen) sensor #1 on bank 1.
Please keep in mind that OEM (original equipment) replacement sensors are recommended (from the dealer). Aftermarket sensors can be less reliable and of poorer quality (not always, but more often). There's also a chance that replacement parts for the P0031 code may also fall under a federal emissions warranty (check with your dealer to see if it's covered).

Aug 20, 2009 | 2006 Toyota Corolla

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