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Thread: Actual cost of a catalytic converter?

  1. #1
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    Actual cost of a catalytic converter?

    I'm seeing prices at Rock Auto for a replacement cat between $150 and $340 USD. My local autoshop was quoting me $900 CAD + labour. So am I correct that's a significant mark up? Just wondering if I'm looking at spending a grand on replacement or not.

    Not sure if it's the pre cat or the final cat that is the issue at this point. Had a rear 02 sensor replaced and then got a new code about cat efficiency. I'm thinking it might be the first catalytic converter, the one on warm up, that's the issue but can't say for sure at this point. I know the car likes to rev to 1500 RPM upon start and then climbs down to a resting 500-700 RPM after about 4 mins. Is this because of the two catalytic converters?

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    I saved considerable money doing it myself.
    2002 Mazda Protege5 Pure White

    MP3 Flashed ECU | Mishimoto Radiator/Shroud | MS Door Sills & Shift Knob | OBX Short Shifter with CorkSport Bushings | Goodridge SS Brake Lines | CorkSport 3rd Link Mod | MPV Wiper Stalk & Tribute Nozzles | S2K Antenna | Cabin Air Filter Mod | Rear Bumper Guard with Matte Black Rear Valance | 205/55R16 Kumho Ecsta 4XII on 03 P5 Wheels

    Among the fair amount of maintenance work done.

  3. #3
    The Diagram Dude pcb's Avatar

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    That's your pre-cat.

    Just do the non-fouler trick and it will clear your code and cost you about $20.

    Check the link on the last post... It comes pre-built now but it doesn't appear to ship to Canada...
    You can probably find it somewhere else that ships to Canada or build one yourself.

    https://www.mazdas247.com/forum/show...=1#post6416347
    The Diagram Dude

  4. #4
    The Diagram Dude pcb's Avatar

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    Quote Originally Posted by Holiday View Post
    . I know the car likes to rev to 1500 RPM upon start and then climbs down to a resting 500-700 RPM after about 4 mins. Is this because of the two catalytic converters?
    That's just the way the car warms up. It takes a bit longer during the winter.
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  5. #5
    Registered Member NaturalFlavored's Avatar

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    If your going to do the non fouler just get a 4-1 header too. But the non fouler is super easy, just need a good drill.

  6. #6
    The Diagram Dude pcb's Avatar

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    Quote Originally Posted by NaturalFlavored View Post
    ... But the non fouler is super easy, just need a good drill.
    Or this... Already built, $10, but doesn't ship to Canada.

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    The Diagram Dude pcb's Avatar

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    I found this one!!!

    It ships to Canada.

    You just unscrew your second O2 sensor, thread this into the hole, then thread your O2 sensor into it and your code is gone.

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    Hey thanks! So what does the mod do? Just trick the sensor in some way or am I bypassing the pre-Cat?

  9. #9
    The Diagram Dude pcb's Avatar

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    It tricks the sensor and ECU into thinking the pre-cat is fine.

    The pre-cat does very little as far as reducing emissions. It only works for two or three minutes on a cold start until the main cat heats up and starts working.
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    Quote Originally Posted by pcb View Post
    It tricks the sensor and ECU into thinking the pre-cat is fine.

    The pre-cat does very little as far as reducing emissions. It only works for two or three minutes on a cold start until the main cat heats up and starts working.
    Ok thanks. So aside form when people buy aftermarket header the only reason people do the non-fouler mod is when the Pre-Cat is on the fritz and they want they light to go away?

  11. #11
    The Diagram Dude pcb's Avatar

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    Correct. To clear the code and pass emissions without having to spend $1000 on a new pre-cat.

    The car will run fine with no problems.
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  12. #12
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    Quote Originally Posted by pcb View Post
    Correct. To clear the code and pass emissions without having to spend $1000 on a new pre-cat.

    The car will run fine with no problems.
    Great, saved me some money there. Cheers.

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