Two problems related to o2 sensor have been reported for the 1999 Mazda Miata. The most recently reported issues are listed below.
Intermittent failure of ignition "coil pack" leading to costly replacement of cat. Converter, O2 sensor, and coil packs. Mfr never covered this under any sort of extended warranty, even though the problem is not uncommon, and evidently bad parts are still in the system. Multiple failure dates.
1999-2000 Miatas have an established intermittent ignition coil failure problem per several owners forums. The ignition coil fails which causes a misfire condition, this results in unburned fuel reaching the catalytic converter where it burns and overheats the converter. This overheating can destroy the converter and potentially destroy the oxygen sensors. This exact scenario happened to me on the indicated date. My vehicle has less than 37k miles on it but is out of warranty and now I must replace the coil and converter. I believe this situation warrants a recall.
| Ignition problems | |
| O2 Sensor problems | |
| Ignition Coils Failure problems | |
| Ignition Module problems |