I am looking for any tips on what I should do before I take it to the dealer. It is showing a 02 sensor code ( bank1 sensor 1, bank 2 sensor 1). I am new to the board and was wondering if anyone else has had this problem and what the answer was. The 4runner has sat for a year and was in an accident. (front left). No modifications
I am looking for any tips on what I should do before I take it to the dealer. It is showing a 02 sensor code ( bank1 sensor 1, bank 2 sensor 1). I am new to the board and was wondering if anyone else has had this problem and what the answer was. The 4runner has sat for a year and was in an accident. (front left). No modifications
Buy the sensors and replace them yourself if you feel comfortable doing it, it's not too difficult. The only answer (if you want the problem fixed and the light off) is pretty much to replace them. I've heard of people removing and "cleaning" the old ones and they'll sometimes work for a few more months but the light will eventually come back on.
Thanks, I just wanted to make sure it was the o2 sensors and not something triggering them. My 4 runner only has 37,000 miles, so
i thought it was weird. From what I am hearing, it sounds like alot of people are having trouble with them.
The manual lists several possibilities for these codes. Does anyone know how to determine which of these items is the cause? I will attach the list of codes and causes.
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03 Stratosphere Mica Stepside, 4.7 L, Supercharger, TRD Package, TRD Exhaust,
Scion Head Unit 08600-21802,
Custom leather heated seats 2 tone with TRD LOGO, Moonroof, ARE LID, ZR3 Laser Shifter, Denso IK22 .4mm Iridium Plugs, Scan Gauge 2,
Rhino Liner, Die Hard Platinum P5 battery 5.7 Killer
I checked the schematics and the EFI relay supplies 12 volts to the EFI fuse 2 (10 amps) so I would check for power to the fuse. The fuse is located under the hood near the battery. The cover has a drawing on the bottom showing the locations of the fuses. If there is 12 Volts there, the relay has to be good. Then I would check the fuse. If good, you could have an open wire in the circuit. A shorted wire would blow the fuse. The fuse does provide power to all oxygen sensors.
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03 Stratosphere Mica Stepside, 4.7 L, Supercharger, TRD Package, TRD Exhaust,
Scion Head Unit 08600-21802,
Custom leather heated seats 2 tone with TRD LOGO, Moonroof, ARE LID, ZR3 Laser Shifter, Denso IK22 .4mm Iridium Plugs, Scan Gauge 2,
Rhino Liner, Die Hard Platinum P5 battery 5.7 Killer
I will go check the fuse.
I replaced the a/f sensors. (the two before the cat). They were the Bosch Universal ones from napa. I will try the fuse and write back if it doesn' work. Thank you for the help.
I will go check the fuse.
I replaced the a/f sensors. (the two before the cat). They were the Bosch Universal ones from napa. I will try the fuse and write back if it doesn' work. Thank you for the help.
Not saying this is why the light is back on, but I would NEVER buy Bosch sensors. If you can't get them from a dealer, try to get some Denso sensors from a parts store. The OEM sensors are usually made by them.
Thank you for your guys help! I am about to pull all of my hair out. I checked the EFI relay and another EFI fuse, but the EFI no2 fuse is not there. I checked to see if there were metal connectors under but it doesn't have any. It looks like one of the empty spots for an option or something. I didn't know if this was normal so I went down to the dealer. They couldn't tell me. I took the fuse box out to see if the connector pins had fallen but couldn't find anything. Do you think NAPA would take the sensors back?
Thank you for your guys help! I am about to pull all of my hair out. I checked the EFI relay and another EFI fuse, but the EFI no2 fuse is not there. I checked to see if there were metal connectors under but it doesn't have any. It looks like one of the empty spots for an option or something. I didn't know if this was normal so I went down to the dealer. They couldn't tell me. I took the fuse box out to see if the connector pins had fallen but couldn't find anything. Do you think NAPA would take the sensors back?
Well, I think I know why you cannot find fuse 2. Let me start by saying I had assumed you had a 4.7 V8. Because you do not have that fuse 2, I looked at the six. It does not have fuse 2. If you do have the six, everything changes. I do not have a code list for the six but if the parts house told you it was "bank 1, sensor 1" and "bank 2 sensor 1", these refer to "air fuel sensors". According to the schematics for the six, bank 1 and bank 2 have a total of 2 heated oxygen sensors called "bank 1 sensor 2" and "bank 2 sensor 2". They also gave 2 air fuel sensors called "bank 1 sensor 1" and "bank 2 sensor 1". I wonder if the parts house sold you the wrong parts. The air fuel sensors have thier own fuse located in the same box you pulled off. It is a 15 amp fuse called AF Heater and also there is a relay called AF Heater Relay. I hope this information allows you to find the source of the problem and I am sorry if my assumption that you had the V8 led you in the wrong direction. Let us all know what you find. Best of luck.
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03 Stratosphere Mica Stepside, 4.7 L, Supercharger, TRD Package, TRD Exhaust,
Scion Head Unit 08600-21802,
Custom leather heated seats 2 tone with TRD LOGO, Moonroof, ARE LID, ZR3 Laser Shifter, Denso IK22 .4mm Iridium Plugs, Scan Gauge 2,
Rhino Liner, Die Hard Platinum P5 battery 5.7 Killer
I am not going to work on it tonight, but I wanted to make sure I understood you correct. I do have the 4.0 v-6. The print out sheet ( I got from Midas and the hand held scanner) lists these codes:
p0031-HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0051-HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
Do all of the sensors have a heater? Are you saying that I would need to replace the ones after the Cat. converter? Or which ones do you think I need to change? I did check the relay (AF Heater relay) and the fuse (AF heater) .They both had 12 volts and seemed fine. I replaced the relay just to make sure it was working as well. I should have paid you the money I gave to the dealer? You are helping more than they did.
I am not going to work on it tonight, but I wanted to make sure I understood you correct. I do have the 4.0 v-6. The print out sheet ( I got from Midas and the hand held scanner) lists these codes:
p0031-HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0051-HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
Do all of the sensors have a heater? Are you saying that I would need to replace the ones after the Cat. converter? Or which ones do you think I need to change? I did check the relay (AF Heater relay) and the fuse (AF heater) .They both had 12 volts and seemed fine. I replaced the relay just to make sure it was working as well. I should have paid you the money I gave to the dealer? You are helping more than they did.
I have never had to change an oxygen sensor or a air fuel sensor so I do not know the difference except that the book lists them as 2 different items, each with their own relay and I would think a different purpose. My V8 for example does not even have the air fuel relay or fuse or wire like your V6 does. This makes me believe, as does the name, that they serve two completely different functions. The fact that Midas list "bank 1 sensor 1 and bank 2 sensor 1 HO2S circuit low" is a contradiction as there are no Oxygen sensors in those positions. There are air fuel sensors according to the book on the V6. I would verify if the sensors changed were oxygen sensors or air fuel sensors. In the position they listed, they should have been air fuel sensors. In answer to the question of heating, the book does call all 4 sensors heated sensors and the schematics show a connection called H or heated. Sorry, I do not know why. If you have not had air fuel sensors installed in the #1 positions that could be the problem. Also, the sensors could have been fine all along and the problem could be some mechanical problem is causing them to tell you there is a problem. I am guessing here but for example I would think if there was a problem causing incomplete combustion, these air fuel sensors would sense that and give off the code to let you know.
I would not change the rear O2 sensors as you have not had a code refering to them. You might want to go to Auto Zone or another parts house to see what they tell you the current code reads. They will do this for free.
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03 Stratosphere Mica Stepside, 4.7 L, Supercharger, TRD Package, TRD Exhaust,
Scion Head Unit 08600-21802,
Custom leather heated seats 2 tone with TRD LOGO, Moonroof, ARE LID, ZR3 Laser Shifter, Denso IK22 .4mm Iridium Plugs, Scan Gauge 2,
Rhino Liner, Die Hard Platinum P5 battery 5.7 Killer
I will go check the fuse.
I replaced the a/f sensors. (the two before the cat). They were the Bosch Universal ones from napa. I will try the fuse and write back if it doesn' work. Thank you for the help.
As stated, the bosch sensors could be the problem. I would take them back and replace them with either dealer parts or Denso.
Yep, that's definitely where I would start. The codes you have were for the 2 front (as in in front of the cat. converters) sensors, which are Air/Fuel Ratio sensors not Oxygen sensors. However, they pretty much look the same and basically do the same thing so if a guy at the parts store called them oxygen sensors that's ok. The Toyota # is 89467-60010 for the 03-04 model year. You need two of the same part number, one for each side. However, the dealer won't refund them because they're electrical parts so NAPA might have the same policy.
2003 4 runner with p0031 and p0051
Linear Mode
