Question about 2000 Mazda MX-5 Miata

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Mazda 2000 MX-5 convertible, 85000 miles.-check engine light remains on. Have replace the crankcase sensor. stalling quit. Both catalatic converter sensors replaced. do I need to replace the CC now?

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  • Craig Collier Apr 01, 2012

    Check your gas cap. It could be loose

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  • Mazda Master
  • 501 Answers

It depend on the code. there are a lot of things other than the O2 sensors. Have it scanned and bring the code back to this sight so we can tell what the problem is.

Most Advance and Autozone store will scan it for free.

Hope this helps

Posted on Oct 01, 2009

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Posted on Jan 02, 2017

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Does the ecm have anything to due with the catalatic converters being removed . I bought the car and found out the ecm was out and that the catalatic coverters had been removed(straight exhaust)


The ECM only monitors many different aspects of the Engine while it's running. The only link I would see between the two is that the Cat.was that the ECM no longer works because they didnt want the Cars computer setting
off any check engine lights etc. When you delete the Cat you delete the cars ability to convert bad vapors into less harmful ones. which in turn would set off the check engine light and not pass inspection.

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1999 miata has check engine light on. i turned it off and it stayed out for about a month. took to autozone had two codes exuast and cat. converter. whats wrong with this car?


exhaust doesnt sound like a code, there should be more to code than cat or exhaust, the cat code is probably like cta efficencey below thrushold. this means the converter is not working, the cause maybe bad cat or bad oxygen sensors, testing may be needed to see if o2 sensors are working good. the exhaust code i dont know, never heard of exhaust code, they may be caused by the same problem, start with the cat code, have o2 sensors (oyxgen sensor) checked or if over 100,000 miles replace them. if converter is bad it a very good thing to also replace the o2 sensors with the new cat.

Aug 20, 2010 | 1999 Mazda MX-5 Miata

1 Answer

The check engine engine light remains on. I have replace bothe sensors on the catalatic converter. Do I need to replace the converter now? Fred


i would replace sensors and then reset check engine light and drive if light comes back on then replace converter, 80% of the converters are condemed because o2 sensors are bad,garage fiqure if they replace everything there sure to fix the problem,but the cost is on you.GOOD LUCK!!!!

Oct 01, 2009 | 2000 Mazda MX-5 Miata

2 Answers

I want to remove the catalytic converter. How do you remove it without a check engine light coming on?


You cannot bypass the catalytic converter and expect the car to run properly and the check engine light to remain off. When you go to replace the cat, DO NOT attempt to use an aftermarket brand. Even many of the "OEM" aftermarket converters do not have sufficient back pressure and within 2 months they are ruined. I know, I have replaced mine that was purchased at Advance Auto Parts three times in the last six months! Shell out the money for an original Mazda converter. List is about $736.50, but you can find a dealer in Virginia that discounts them 20% down to $589.08. Just remember, the car's computer is programmed to read the O2 sensors' data and adjust accoringly. A new Mazda cat will allow your car to run like it did when it came off the assembly line, everything else equal.

Jun 30, 2009 | 1999 Mazda MX-5 Miata

2 Answers

2000 Mazda Miata, check engine light comes on. Code PO420


I HAVE A 2000 MAZDA MIATA AND IT IS BRINGING UP A CODE PO421, CAN YOU TELL ME WHAT THAT IS

Dec 15, 2008 | 2000 Mazda MX-5 Miata

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Check engine light


did you ask the dealer if the car an an emissions recall for this problem

Sep 04, 2008 | 1999 Mazda MX-5 Miata

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Check engine light is on. The error code is P0420. Catalyst efficiency below threshold (Bank 1). Had converter checked and it was ok. There is a oxygen sensor before the converter and one after the...


ok the bank 1 is where the cilinder one is get a firing order and see where is the number one cylinder that's the bank one
then follow the exaust and replace the sensor after the catalitic
or converter

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