Numbers

There are 2 sensors on the firewall on the drivers side. Check both with a meter gauge to see if they are working. Mine as the sensor to the right if you are looking at the shivers seat. Hope this helps

I changed my plugs a couple of weeks ago. My first startup after the work everything great. 2nd start brought me a po403. Cleared code started again, no problems, next start brought back 403. Cleaned egr, same result, 2nd start brings on code. How can code come only on 2nd start after being cleared. I drove 40 miles after clearing the code, runs great, stopped and restarted and code back, again car runs good. any thoughts, thanks. This is a 2003 mazda6 6cyl.