Question about 2007 Toyota Corolla

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Diagnose computer says faulty oxygen sensor, - how many oxygen sensors are there in this car? - Where are oxygen sensors located?

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One and it will be on the exhaust manifold

Posted on Dec 30, 2010

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Toyota tundra oxygen sensor


Just because you get a diagnostic trouble code (DTC) saying something to the fact of the heated oxygen sensor, it doesn't always mean that it is the sensor itself. I am guessing you cleared the code and it is returning with the same DTC. If you haven't you have to clear the DTC. As I was saying your computer detcts manying different things in the oxygen sensor circuit but other things could cause a DTC. I'm guessing that the DTC you have been getting is in the P0130's (130, 133, 134 and so on). There are a few tests in order to determain the cause. Say your computer is detcting a lean burning condition in the O2 sensor circuit. That could mean a leak in the exhaust or a vacuum leak. A rich burning condition means that you're computer is detecting to much fuel getting into the exhaust which could be a faulty injector. You could have an open circuit in the wiring from the O2 sensor to the computer or even a faulty ground. this is where diagnosing so so important and being in the business I get upset with these auto parts stores that pull DTC's for free and then tell you it's a sensor or something and people purchase the sensor without fully diagnosing the problem and just end up replacing the sensor. Not only have they waisted money for a not needed part, they cannot even return it due to the fact it's an electrical item even though one of thier sales clerks have told them that's the problem. Not sure if this is the case for you but I hope you get the idea. If you can get me the DTC I'll be happy to help you try and diagnose the problem. You can reply/comment back here or feel free to email me at csautomotivecars@att.net.

Jul 14, 2013 | Cars & Trucks

1 Answer

CHECK LIGHT ON WITH A P0420


Error Code: P0420
Fault Location:
Catalytic Converter System, Bank 1 - Efficiency Below Threshold
Possible Cause:
Leakage in Intake and/or Exhaust System.
Catalyst faulty.
Oxygen Sensor(s) faulty.
Oxygen Sensor(s) Control faulty.
Possible Solutions:
Check Intake and Exhaust System for Leaks.
Check Catalyst.
Check Oxygen Sensor(s).
Check Oxygen Sensor(s) Control.
Perform Oxygen Sensor(s) Aging Check.

Mar 19, 2013 | 1999 Honda Civic

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WERE CAN I FIND P0420


Error Code: P0420
Fault Location:
Catalytic Converter System, Bank 1 - Efficiency Below Threshold
Possible Cause:
Leakage in Intake and/or Exhaust System.
Catalyst faulty.
Oxygen Sensor(s) faulty.
Oxygen Sensor(s) Control faulty.
Possible Solutions:
Check Intake and Exhaust System for Leaks.
Check Catalyst.
Check Oxygen Sensor(s).
Check Oxygen Sensor(s) Control.
Perform Oxygen Sensor(s) Aging Check.

Mar 19, 2013 | 1999 Honda Civic

1 Answer

I have check engine light on and whe i checked the code is p4029


P0429 Description The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).



A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.



When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.
Possible causes - Catalyst Heater Control harness is open or shorted
- Catalyst Heater Control circuit poor electrical connection
- Faulty Powertrain Control Module

Oct 19, 2012 | 2002 Mitsubishi Galant

1 Answer

How do you change the o2 sensor on a 2003 impala


I wouldn't trust anything the Zone tells you. Most oxygen sensor codes are NOT caused by the oxygen sensor. Of coarse, a lot has to do with WHICH O2 sensor code you have. For example, codes P0130,P0131,P0132,P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171 and P0172, are all valid oxygen sensor/fuel trim codes for a 2003 Chevrolet Impala equipped with a 3.4L V-6 engine.
How you would go about troubleshooting the problem depends on which "oxygen sensor code" you have. Many times, the code can be fixed by simply repairing a leak in a vacuum hose. Quite often, these codes are caused by faulty mass airflow sensors. Then again, every once in a while, the problem is actually the oxygen sensor itself. However, if you go by the knowledge and experience in diagnostics that exists at the Zone, you will be changing an oxygen sensor EVERY time. Then when that does not fix the problem, you will be out the cost of the oxygen sensor, PLUS you will STILL have to diagnose the problem to fix it!

Many people think that all an automotive repair technician does is plug in the "magic box" and replace all the parts that the box (computer) tells them to replace (and the people at the Zone like it that way). TRUST ME, it does not work that way! I WISH it was that simple.

FYI: On Board Diagnostic (OBD) Diagnostic Test Codes (DTCs) NEVER tell you what parts to replace. They are called DTCs because for a trained technician, they tell him which of the hundreds of DIAGNOSTIC TEST ROUTINES to perform in order to diagnose the fault and pinpoint the CAUSE of the problem.

Just a little professional advice from someone who has been diagnosing and repairing cars for about 37 years...do with it as you will.

Mar 22, 2012 | 2003 Chevrolet Impala

1 Answer

I HAVE A1996 FORD EXPLORER WITH CODES PO133:02,PO155:02P1115


DTC P0133 - Oxygen Sensor Circuit Slow Response (Bank1, Sensor1)
This involves the front oxygen sensor on Bank 1. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use. You will likely not notice any drivability problems, although there may be symptoms.

A code P0133 may mean that one or more of the following has happened:
The oxygen sensor is faulty
The wiring to the sensor is broken / frayed
There is an exhaust leak


DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
This code refers to the front oxygen sensor on Bank 2. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0155. See also: P0135 (Bank 1). You will likely notice poor fuel economy the illumination of the MIL.

A code P0155 may mean that one or more of the following has happened:
O2 Heater element resistance is high
Internal short or open in the heater element
O2 heater circuit wiring high resistance
open or short to ground in the wiring harness


DTC P0306 - Cylinder #6 Misfire Detected
A P0306 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #6. Symptoms may include the engine may be harder to start, the engine may stumble / stumble, and/or hesitate or other symptoms may also be present.

A code P0306 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer


DTC P1115 - Intake Air Temperature 2 Circuit High Input (Super/Turbo Charged engines)


In the next diagram could checl this specific location about each O2 sensor...

zjlimited_8.jpeg


Hope this helps.

Oct 05, 2011 | 1996 Ford Explorer

1 Answer

I have a1996 ford explore with this codes p0133:02,po155:02,p1115andpo0306


DTC P0133 - Oxygen Sensor Circuit Slow Response (Bank1, Sensor1)
This involves the front oxygen sensor on Bank 1. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use. You will likely not notice any drivability problems, although there may be symptoms.

A code P0133 may mean that one or more of the following has happened:
The oxygen sensor is faulty
The wiring to the sensor is broken / frayed
There is an exhaust leak


DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
This code refers to the front oxygen sensor on Bank 2. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0155. See also: P0135 (Bank 1). You will likely notice poor fuel economy the illumination of the MIL.

A code P0155 may mean that one or more of the following has happened:
O2 Heater element resistance is high
Internal short or open in the heater element
O2 heater circuit wiring high resistance
open or short to ground in the wiring harness


DTC P0306 - Cylinder #6 Misfire Detected
A P0306 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #6. Symptoms may include the engine may be harder to start, the engine may stumble / stumble, and/or hesitate or other symptoms may also be present.

A code P0306 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer


DTC P1115 - Intake Air Temperature 2 Circuit High Input (Super/Turbo Charged engines)


In the next diagram could checl this specific location about each O2 sensor...

zjlimited_7.jpeg


Hope this helps.

Oct 05, 2011 | 1996 Ford Explorer

1 Answer

I'm getting a P 1133 error code for my 2000 subaru outback limited wagon. Is it a faulty Heater circuit or an oxygen sensor? Also where are these parts located on the car? Thanks


The definition of Diagnostic Test Code (DTC) P1133 = "FRONT OXYGEN (A/F) SENSOR HEATER CIRCUIT HIGH INPUT"

Please note that DTCs (A.K.A. "fault codes") NEVER tell you what parts to replace.
The DTC here is telling you which CIRCUIT is malfunctioning. The circuit must be diagnosed to find the exact CAUSE of the malfunction.

The possible causes of this DTC are:
> Battery short circuit in harness between Engine Control Module (ECM) and front oxygen (A/F) sensor connector
> Faulty ECM

Please also note that this is NOT a typical O2 Sensor circuit. This is a 6-pin Air/Fuel Ratio sensor. Proper scan tool and datalink interface equipment is REQUIRED to properly diagnose these circuits.

Where the parts are located:
The A/F sensor is located in the exhaust pipe in front of the catalytic converter. The ECM is located Under the carpet in the passenger front foot-well area. The circuits are located between the two.

Please also Review this article:
What Else Could Be Wrong?

Sep 08, 2011 | Subaru Outback Cars & Trucks

3 Answers

2001 Nissan Sentra. Car starts with no power, but after a few restarts, gain power again. Code is PO420.


Hi, P0420 code means a catalytic converter fault.
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter

Jul 22, 2011 | Nissan Sentra Cars & Trucks

1 Answer

PO 420 This is the code that showed up. How do I check it and tell what is wrong?


P0402: Catalyst System Efficiency Below Threshold Bank 1

The ECM or PCM monitors the switching frequency ratio of heated oxygen sensors 1 and 2. A three way catalyst converter(Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase. When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst (Manifold) malfunction is diagnosed.

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Possible Causes:
- Three way catalyst converter Bank 2
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module

Possible Solutions:
The most common cause is the three way catalyst converter Bank 1. Changing just the O2 sensor usually doesn't repair the problem.

Jan 15, 2011 | 2005 Honda Accord

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