Question about 2000 Mazda MX-5 Miata

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Engine light on, mazda mx5, 1999

I replaced the 1st O2 sensor, the light went off for a whilw, but it came back

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  • maccabej May 21, 2009

    Apparently there are three ways to get rid of a check engine light.
    One is remove the three fuses called BN 20a fuses under the hood on the right hand side near the firewall. This will get rid of a lignt intermittent when either the gas cap is not on tight enough. It could also come on if the crossover in the intake manifold is clogged. Expensive repair. The nextt option is to check the Mass Air Flow sensor and the TPS switch. Check range of voltage output from each. Easy test. The others could be EGR valve or either of the TWO O2 sensors. They both should swing through different voltages cold and hot. These are tests done with a meter that reads from under the dash. O2's are very expensive. Usually the rear is the culprit. Hope this helps.

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Clean the egr valve out with carb cleaner will work for a while but cant promise how long

Posted on Feb 21, 2009

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Then the Check Engine light came on again (with a different code), and I had to leave the van with him all day.

Cost to replace and install that sensor = $115.

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Location O2 sensor after cat for Mazda Miata 2002


Just had BOTH of my O2 sensors replaced in my 2002 Miata.  The sensors are located
1. at the back of the engine compartment look down (on the passenger side ) You should see a spark plug looking device near the bottom of the engine (on the side) it has a short wire output that goes to a connector looking device on the other end. This O2 sensor had a short wire connector on the other end
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2.  This one is tougher --- From underneath the vehicle just after the catalytic converter  you should be able to see the Spark plug like O2 sensor .  The person who repaired it for me had to trace the wire from the O2 sensor.  It goes up into ( perhaps the frame or bottom of the vehicle INTO the Driver compartment under the drivers seat.  It is located near the Center Console  right at the carpet seam. It was about in a straight line from the BACK of the Drivers side Car Door.  He felt around -- and located the Connector (under the carpet near the center console. .  He checked underneath the car to the point where the wire disappeared --to confirm he had the correct wire.  
Once he located where the sensor wire led to --He had the old sensor out and wire connector disconnected and a  New sensor and the connector installed in about 10 minutes.  
The O2 sensor for this one was much longer than the first O2 sensor in the engine compartment He had to use some sort of standard release spray on the old sensor itself --to remove the old O2 Sensor.   Since it is exposed to the elements under the car.   Wrench, I think a screwdriver  and the spray were all the tools I remember him using.....

The autozone code indicated only the engine compartment sensor was bad.
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I fixed the first one only -- turned out the warning light lit up a day or so later indicating the second O2 Sensor under the vehicle was bad.  Fixed that as well -- have had no problems since -- repair was about 4 months ago.....

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1 Answer

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I have a 2004 Mazda 3. Check engine light came on. After a couple days it went off. Then a couple days later it came back on. Code was P0421, Warm up catalyst effeciency below threshold bank 1. I am...


It can be hard to say which it is, because either one will trip the the code, but in this case I'd place my bet on it being the O2 sensor because it says "warm up" - the O2 sensor has to be up to temperature (around 900 degrees) to function. The computer watches for the O2 sensor to heat up in a certain amount of time, and if it doesn't get to temperature soon enough, the computer diagnoses a faulty heater for the O2 sensor and trips the code.

For the record, this would be the secondary O2 sensor, the one after the cat. That's the one that is used to determine cat functionality and efficiency. The primary sensor, before the cat, is used to fine-tune the fuel delivery.

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