Question about 2000 Toyota Corolla

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How to replace oxygen sensor in toyota corolla

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  • 34 Answers

They are two oxigen sensors. High and low, before you change any one of them, tray to take your car to autozone or napa. They can check it for you for free, and they can tell you which one you need to change.
both oxygen sensors are in the bottom of the car, before and after catlic converter. Make sure you left the car using hydraulic or mechanical jack and secure it with 2 stands. disconect the ox sensor and remove it from the exhaust pipe. Let me know if you still have any problem

Posted on Oct 04, 2009

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Posted on Jan 02, 2017

  • 1116 Answers

SOURCE: DTC P0420 on 99 Toyota Corolla Which oxygen sensor

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.
Symptoms You will likely not notice any drivability problems, although there may be symptoms.
Causes A code P0420 may mean that one or more of the following has happened:

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Possible Solutions Some suggested steps for troubleshooting a P0420 error code include:
  • 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
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Posted on May 26, 2011

RixsFixes
  • 2200 Answers

SOURCE: I have an engine light on to my Toyota Corolla

Hi

The trouble areas associated with this code are as follows:
1)Gas leakage on exhaust system
2)Oxygen sensor
3)Heated oxygen sensor
4)Three–way catalytic converter

The idea is to check for exhaust leaks first then the front sensor and rear sensor. If these all check out then the cat needs to be replaced.

Hope this helps. Thanks for using fixYa

Posted on Nov 06, 2009

  • 740 Answers

SOURCE: 2001 Toyota Corolla Check Engine Light

You cannot guess with these cars,these vehicles have a lot of sensors and actuators can can go bad at anytime, here is my suggestion take your vehicle and to Auto_zone and have them check the codes, they will be able to tell you what they mean. ITS FREE.. then get back to me if you need more help.

Posted on Dec 23, 2008

  • 41 Answers

SOURCE: Replacing and oxygen sensor

1989 has one oxygen sensor. 1996 and up have two, three, or four. Depends on which engine and exhaust system you have.

Posted on Nov 11, 2008

  • 973 Answers

SOURCE: Where is the oxygen sensor located in the 2000

Depending which O2 sensor it is, it will be located after the exhaust manifold before or after the Catalytic Converter.

Posted on Jun 24, 2010

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Toyota corolla 2009 oxygen sensor problems


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Possible causes- Faulty Rear Heated Oxygen Sensor Bank 1
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1 Answer

DTC P0420 on 99 Toyota Corolla Which oxygen sensor to replace- before or after the catalytic converter?


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.
Symptoms You will likely not notice any drivability problems, although there may be symptoms.
Causes A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Possible Solutions Some suggested steps for troubleshooting a P0420 error code include:
  • 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
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

May 26, 2011 | 1999 Toyota Corolla

1 Answer

Where is the oxygen sensor located on a 1994 toyota corolla? how do you install an oxygen sensor on a 1994 toyota corolla?


You need to follow your exhaust. You have two. One in the front and one in the back. All you do is plug one side into the electrical connector and the other side screws into the exhaust. You need to find out if it is the upstream sensor or downstream sensor before you change that one. The one in front is upstream.

Feb 10, 2011 | 1994 Toyota Corolla

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How many oxygen sensors are on a 1996 1.8L toyota carolla? 2 or 3?


Hi:
Your Corolla has 2 oxygen sensors; one before the catalytic converter, and one after!

Oct 06, 2010 | 1996 Toyota Corolla

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1997 corolla codes p0130 / 0133


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Code 21 on toyota corolla 1993


Code 21 is an oxygen/heater sensor, replace the main o2 sensor and clear the code, or sometimes you can just clear the code and it wont come back. Problems with the o2 sensor are normal and usually not that big of a deal.

Mar 24, 2010 | 1993 Toyota Corolla

3 Answers

I have an engine light on to my Toyota Corolla 2003; diagnosed by the autozone OBD11 SCANNER P420. I replaced the oxygen sensor and the light deleted. After driving the car for 30 miles the light came on...


Hi

The trouble areas associated with this code are as follows:
1)Gas leakage on exhaust system
2)Oxygen sensor
3)Heated oxygen sensor
4)Three–way catalytic converter

The idea is to check for exhaust leaks first then the front sensor and rear sensor. If these all check out then the cat needs to be replaced.

Hope this helps. Thanks for using fixYa

Nov 05, 2009 | 2003 Toyota Corolla

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2001 toyota corolla check engine light is on. Code reads P420 low threshold. Changed front and rear Oxygen sensors reset the light and drove the car 50 miles and the light came back on. the car will not...


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Aug 06, 2008 | 2000 Toyota Corolla

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