P0141 code for 2002 highlander 4 Cyl. 2.4L engine.?

Question

Hi,

I received this code after I got check engine light. I found out that it is for Bank 1 Sensor 2 after CAT converter. 

I orders part and replacedd.Stilll light in not gone. Once rest by meter right after O2 sensor wasreplacedd, than drive at least 10 miles, and removed battery connection, I also drive about 100 miles and removed battery connection. Every time light goes off when I remove battery connection, but after 3 to 4  miles of driving, it comes back. 

I wan to know if I have replaced correct O2 sensor. I replaced the one on the bottom of the engine and it is on passenger side.Can some one tell me if that is the correct sensor for this model?

? · Accepted Answer

This trouble code has nothing to do with the way the engine is running. It could not be caused by bad plugs or plug wires or a dirty air cleaner or anything like that.

Modern O2 sensors are heated electrically, so that the engine goes into closed-loop sooner, reducing cold-start emissions. Yours not doing that is what's lighting the CEL and setting the code.

There wasn't necessarily anything wrong with any of the O2 sensors in the first place. The problem needs to be properly diagnosed if you want to be sure it gets fixed.

As is often the case, just because a part is named in a trouble code title does not mean the problem will be fixed if you just replace that part.

As far as whether you even replaced the one mentioned, I'm not sure. There are only 2 on your vehicle, because it's a 4 cylinder. They're both Bank 1 because it's a 4 cylinder. Sensor 1 always is closest to the engine, and Sensor 2 is further downstream. The one mentioned in the DTC is after the Catalytic Converter. The other one would usually be mounted in the exhaust manifold.

HO2S12

H=Heated
O2=Oxygen
S=Sensor
1=Bank 1
2=Sensor 2
________________________________________________________________________

P0141Toyota 

HO2S12 HEATER CIRCUIT Malfunction

Probable Cause[s]

   1. Open or short circuit condition (broken or grounded wire)
   2. Poor electrical connection (corroded or loose terminals)
   3. EFI Relay Fault (supplies the electricity to heat the O2)
   4! Faulty HO2S12 (these causes are listed in order of probability)
___________________________________________

Hey Raja,

Saw the additional details you posted. Still not sure what the deal is with the 3rd and 4th O2 sensors you're talking about, but I found a diagram that shows where Bank 1 Sensor 2 is located. It's in GIF. format, so it may not open in your default viewer if you're running Vista (like me) or W7. I opened it in Windows Paint worked for me.

http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0996b43f/80/20/47/a7/medium/0996b43f802047a7.gif

? · Answer

6 Cyl is plenty greater suitable than a 4 cyl. greater torque. the 4.0 potential the displacement of engine in liters. between the ideal engines ever utilized in a Jeep interior the 4.0 L in-line OHV 6 cyl, at times customary via fact the 4.0 HO. the present 6 cyl utilized in new jeeps is the Chrysler based 3.7 or 4.0 V6. whilst those are as effectual via fact the outdated in-line 6 they do no longer seem to be as torquey at low engine speeds and as a result do no longer pull as nicely interior the off-highway situations Jeeps are customary for.

Michael S · Answer

What the Check Engine light is actually saying is that sensor is sending information to the ECU that is outside the parameters. It doesn't tell you that the sensor is bad.
Something else is causing that sensor to send wrong information. It has to do with how your car is running. You probably need a complete tune-up because this is a 2002 model.
That includes spark plugs and wire, air filters, PCV valve, oil and filter change.
This is probably the first thing anyone should do when they get a check engine light for an O2 sensor.

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P0141 code for 2002 highlander 4 Cyl. 2.4L engine.?

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