Cam Position Sensor

My Miata was only hard to start when the engine was warm and on a warm or hot day. When the engine was cold it would start fine. But then when it was hot and on a hot day that took it a long time to cool down it would just crank and not fire up.

For a long time I was only receiving an EGR error code. PO402 EGR Flow Excessive Detected. It took a period of about two years and then it started throwing out a cam position sensor code. I replaced it and both of my errors went away. Prior to that I was replacing wires and plugs each summer. That seemed to get me through. This time I replaced the coils and that did nothing to help. So even if you are not getting the cam position sensor code on your miata You might think about changing it out.

5 thoughts on “Cam Position Sensor”

  1. Yes, when mine gets too hot (its 101 today} it will not start until I open the hood to let it cool. It misfires a few times, too. I replaced the coil two years ago; will try the sensor. Thanks!!

  2. Worked like a charm. Super easy to replace– literally took one minute. Ordered the part from O’reillys for about 70.00. It runs smoother and starts right up. Thanks!!!

  3. Luckily, I was in front or beside a bar three times the other day in 100 degree temps in Florida when my hot Miata would not start. I left the hood open and went back into the saloons. I’m not going to fix it! Really, a new cam position sensor for $95.00 at Advance Auto took care of the problem.

  4. Thanks for the info and pics. On my 2002 Mitata, the cam position sensor was on the top back left of the engine and was very easy to replace, once I found it.

  5. This happened to me many times and I’ve had it in the shop 3 times. When the engine got hot usually after driving 20 mins or so on the hwy it would quit and not start back. It would take a frustrating 30 mins to get it to fire. So I started raising the hood when it happens and it starts in just a couple of mins. They didn’t know what was wrong so they replaced the fuel pump. An expensive wrong guess. Second time he changed some type of coil wire. Again wrong guess. Finally it happened and the check engine light stayed on long enough that I could get it read at O’Reilys. So the third trip they replaced the sensor and still no help. Now they tell me it probably has to have a Mazda part instead of an aftermarket. Fortunately they are going to take the aftermarket sensor off and refund that toward the slightly more expensive Mazda sensor. I hope the sensor will be in next week for another round.

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