Question about 2000 Toyota Celica

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TOYOTA CELICA 2000

HEY HOW IS IT GOING, WELL WE GOT THE CAR BACK AND IT NEEDS A CATALYTIC CONVERTER. ITS NOT WORKING CORRECTLY, AND NEW OXYGEN SENSOR, I FINALLY CHECKED OUT THE MAF SENSOR IT WAS REAL DIRTY. THEIR WAS NO FUZZ ON THE WIRES JUST DIRT. ITS LOOKS LIKE A THIN WIRE 2 OF THEM.. HOW CAN I CLEAN THIS? I ALSO NEED A NEW VALVE COVER GASKET AND THEIR IS TWO SMALL HOLES ON THE RESONATOR.. ONCE AGAIN THANK YOU.. PLEASE GET BACK TO ME WITH YOUR FEED BACK.. TAKE CARE..


FLACKO50

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  • Toyota Master
  • 1,861 Answers

Go to your auto parts store & buy a can of "brake cleaner". Remove the MAF and spray it until the wires are shiny.
Do not use compressed air, that will break the wires.
BTW, the cat is covered for 8 years, under warranty.

Posted on Dec 16, 2008

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P0421 TOYOTA AVENSIS


indicating the catalytic converter is not operating as well as should be, first i'd check all the pipework going into and from the air intake and inlet manifold for any sign of cracks etc as if air going in is'nt correct the exhaust will be giving a false reading if all looks ok add a catalytic converter specific fuel additive following instructions then after running a tank of fuel through have the code cleared and then road test and recheck for the code if still reading 0421 may have to change the sensor upstream on the cat

Apr 24, 2014 | 2000 Toyota Celica

1 Answer

P 0420 code on toyota corolla2004


Hi there:
A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • A damaged or failed oxygen sensor (HO2S)
  • Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
  • ******** spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
  • Leaking fuel injector or high fuel pressure
  • Cylinder misfire
  • Oil contamination

About the possible solutions, some suggested steps for troubleshooting 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 (HO2S), replace if necessary
  • Replace the catalytic converter
Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily.
We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter.

Hope this helps.

Dec 08, 2012 | 2001 Toyota Corolla

1 Answer

I have a po 420 sensor how can I fix it


this obd2 trouble code table can help you understand the meaning of code, for po420, you can try:
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.

Sep 06, 2011 | 2000 Toyota Celica

2 Answers

Where does a oxygen sensor go on a toyota celica 2000 ?


  • Locate the upstream and downstream oxygen sensors under the vehicle near the front axle. The upstream and downstream sensors resemble spark plugs with several wires connected to them. Remove the sensors by turning them clockwise with a 22-millimeter wrench.Locate the wiring harness inside the vehicle under the center console on the front passenger side. Disconnect the electrical connectors for the oxygen sensors. Feed the wires down through the vehicle and pull them out under the car.Feed the wiring assemblies on the new sensors up through the floor of the vehicle. Reconnect the wires in the wiring harness. Screw in the new oxygen sensors with your fingers. Once they are in place, tighten them with a 22-millimeter wrench.Remove the jack stands and lower the Celica to the ground. Remove the tire blocks. There should be a sensor before the CAT converter, and one RIGHT after it.


  • May 17, 2011 | 2000 Toyota Celica

    1 Answer

    My 2000 Cadillac Deville engine light on. Engine code PO420


    Catalyst System Efficiency Below Threshold (Bank 1)

    A code PO420 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 reading

    • 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

    May 11, 2011 | 2000 Cadillac DeVille

    1 Answer

    Have a p0420 code on 2000 celica should i replace o2 sensors or cat


    The catalytic convertermag-glass_10x10.gif 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.

    Feb 17, 2011 | 2000 Toyota Celica

    3 Answers

    Were on exaust is oxygen sensor in 1999 subaru impreza auto sport


    On the SOHC engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On the DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the catalytic converter.

    Oxygen sensor location-Baja 2.5L SOHC engine
    c3fce0b.jpg

    Oxygen sensor location-Baja 2.5L DOHC engine
    7aac75e.jpg


    On the 2.0L engine the front (A/F) oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter.

    Oxygen sensor location-Impreza 1998-2001 2.2L engine
    a5973e4.jpg


    moz-screenshot.pngOxygen sensor location-Impreza 1998-2002 2.5L SOHC engine
    3a84717.jpg
    I hope helped with this; remember rated this help. Good luck.

    Nov 20, 2009 | 1999 Subaru Impreza

    2 Answers

    Locate O2 Sensors


    both these sensors are located before the catalytic converter,sometimes in the exhaust manifold. are you sure that's the problem. Usually they both don't go at the same time. Are they running rich or lean, get back to me and we'll go from there Thanks Ray

    Nov 09, 2009 | 2000 Toyota Camry Solara

    1 Answer

    $250 oxygen sensor parts only 2002 Jeep GC too much? needed?


    YEP A BAD OXYGEN SENSOR WILL CAUSE ENGINE TO RUN RICH.CAUSING UNBURN FUEL TO GO TO THE CATALYTIC CONVERTER AND BURN IT OUT.

    Aug 23, 2009 | 2002 Jeep Grand Cherokee

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