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Thread: Toyota Vitz 2003 Check light on After Cat. Converter removal

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    Default Toyota Vitz 2003 Check light on After Cat. Converter removal

    Hey PW's,
    I had my vitz's Cat converter removed after it had become extremely heavy and the average had gone down to 7-8 per liter. I showed it to the exhaust wala. He said that he would remove the cat. He said that no complications would be involved and all. After he had replaced it, the light came on. I first disconnected the terminals (battery) and it went away. It came back after a while. I showed it to toyota who scanned it and told me I needed to replace my Cat converter and O2 sensor. He estimated nearly 120k for both! I went back to the exhaust wala. He sent me to a mechanic of his. The mechanic said that the catalytic converter was choked. The ECU had set the values accordingly. The heat valve had been opened. Now when it was able to get air, it could not re adjust the values. He said that I need to replace the O2 sensor and it would go away as the new sensor would adopt to the conditions. He quoted a total of 4000/- with labour for a Kabuli sensor. I need to get this light to go away. What should I do? I'm really worried! Please reply urgently! Does anyone know any toyota (japenese) spare ppart dealer in Bilal gunj? I need to get a new Oxygen sensor with a Catalytic converter.
    Under the Coconut tree

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    Quote Originally Posted by abzia View Post
    In my opinion, there is a chance that cable got broken during cat removal. You can rule this out by measuring voltage on the O2 sensor (it should be between 0.1 ~ 0.9V

    By the way how is the fuel consumption? Worse case scenario is that your O2 sensor might be faulty and put you in limp mode, hence increase fuel consumption.
    Fuel average is the same as before.

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    Then there is a good chance that your O2 sensor is at fault.

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    Quote Originally Posted by abzia View Post
    Then there is a good chance that your O2 sensor is at fault.
    The average has been around 7-8 km/ltr from the start!

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    Please verify voltage across O2 sensor, it should be the first diagnostic step IMO

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    Quote Originally Posted by abzia View Post
    Please verify voltage across O2 sensor, it should be the first diagnostic step IMO
    Tmrw, inshaa Allah!

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    Quote Originally Posted by LIANARULES View Post
    I've anxiously been waiting for him (@Xulfiqar) to reply. However, cleaning the sensor won't cause any harm, no?

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    Do not attempt to clean the O2 sensor with anything.

    As you have removed the cat, you have to simulate the signal wave to the ECU now, at the moment the post cat sensor is seeing full wave swing because the cat is missing.

    you can shroud the sensor to limit the wave amplitude - it may or may not work, but the driveability also goes down the gutter because your exhaust is not tuned correctly to work without a cat.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    Do not attempt to clean the O2 sensor with anything.
    Thank you so much for replying! Can you please getting rid of the checklight?

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    Bump

    Sent from my C2105 using PW Forums mobile app
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    solutions.

    1 - replace cat
    2 - emulate signal
    3 - shroud sensor

    the first is guaranteed to work, the second and third are a hit or miss.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    solutions.

    1 - replace cat
    2 - emulate signal
    3 - shroud sensor

    the first is guaranteed to work, the second and third are a hit or miss.
    Can you explain the 2nd and the third? Thanks

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    Quote Originally Posted by Xulfiqar View Post
    Do not attempt to clean the O2 sensor with anything.

    As you have removed the cat, you have to simulate the signal wave to the ECU now, at the moment the post cat sensor is seeing full wave swing because the cat is missing.

    you can shroud the sensor to limit the wave amplitude - it may or may not work, but the driveability also goes down the gutter because your exhaust is not tuned correctly to work without a cat.
    Sir almost half of the Cars running in Pakistan have their Cats removed by idiotic Ustaads, why don't their Check lights show up?
    I have had a Vitz with the Cat removed by the previous owner, the Car had excellent pick and did not vibrate or knock as the Vitz is famous for here, the only bad i felt was it sounding like a two stroke rickshaw , that too was solved by adding a dholki in the rear.
    Laws r Made to be Broken

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    Quote Originally Posted by muradi View Post
    Sir almost half of the Cars running in Pakistan have their Cats removed by idiotic Ustaads, why don't their Check lights show up?
    I have had a Vitz with the Cat removed by the previous owner, the Car had excellent pick and did not vibrate or knock as the Vitz is famous for here, the only bad i felt was it sounding like a two stroke rickshaw , that too was solved by adding a dholki in the rear.
    If your car has a post cat o2 sensor it will throw a check light at you if your cat is dead/gutted/missing. If it does not then it wont.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by LIANARULES View Post
    Explain please. Thanks

    Sent from my C2105 using PW Forums mobile app
    There are two types of O2 sensor simulator,one is electronic base and other is mechanical type,usually second one is very simple and easy to fabricate.
    Buy two spark plug adopter and widen its hole by using a thick drill bit,remove O2 sensor and install both the adopter on the O2 sensor port, then screw the O2 sensor back into those adopters.
    It slows the reading down on the secondary 02 sensor by moving it out of the exhaust flow thus fooling the ECU into thinking the CATS are still in it.
    You can fabricate that adopter by a machinist(Lath walla) and its length should be in between 2 to 2.5 inch.
    Never loose hope in life,every step gives u something.

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    Quote Originally Posted by argtr65 View Post
    There are two types of O2 sensor simulator,one is electronic base and other is mechanical type,usually second one is very simple and easy to fabricate.
    Buy two spark plug adopter and widen its hole by using a thick drill bit,remove O2 sensor and install both the adopter on the O2 sensor port, then screw the O2 sensor back into those adopters.
    It slows the reading down on the secondary 02 sensor by moving it out of the exhaust flow thus fooling the ECU into thinking the CATS are still in it.
    You can fabricate that adopter by a machinist(Lath walla) and its length should be in between 2 to 2.5 inch.
    My car is giving a code for the heater circuit, however, I will still try this ASAP!
    Under the Coconut tree

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    Got quotes for a new O2 sensor. Brand new (original) for 14k Kabuli for 3500.

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    Quote Originally Posted by LIANARULES View Post
    My car is giving a code for the heater circuit, however, I will still try this ASAP!

    check the voltage at the sensor, one leg of the heater should show 12V with ignition on, the other leg is controlled ground by the ECU to switch it on or off as required.

    Firstly get a replacement sensor - I have come to know that exhaust repair shops in Pakistan are also selling these as used parts now. Check the resistance of the heater - it should be 12 ohms - if not - the sensor heater is shot. All other repairs and emulations follow afterwards.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    check the voltage at the sensor, one leg of the heater should show 12V with ignition on, the other leg is controlled ground by the ECU to switch it on or off as required.

    Firstly get a replacement sensor - I have come to know that exhaust repair shops in Pakistan are also selling these as used parts now. Check the resistance of the heater - it should be 12 ohms - if not - the sensor heater is shot. All other repairs and emulations follow afterwards.
    Will do, tmrw, Insha Allah. However, this toyota dealer suggested me to use Hi-Octane as he thought that some carbon had built up over the sensor. Thanks for the reply! Really appreciate it

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    toyota dealer just bullshitted you, im thinking the sensor got damaged during cat con removal or just because of aging
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by LIANARULES View Post
    Will do, tmrw, Insha Allah. However, this toyota dealer suggested me to use Hi-Octane as he thought that some carbon had built up over the sensor. Thanks for the reply! Really appreciate it

    Sent from my C2105 using PW Forums mobile app

    You should have asked for a "kash" of the sutta he was smoking - it was loaded with really really good stuff I think. The guy thinks that HOBC is a detergent. - NICE - hi-five man.
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    every mechanic here thinks of HOBC as a detergent.. you know the 1fz I'm working on - I have been seriously suggested by some seniors in the industry to put in HOBC, hand it over to the customer and be done with it
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