Where is the egr valve position sensor on 1998 Mazda Protege?
The egr position sensor is made into the egr valve. Look for the egr valve and you will find a plug with wires plugged into the egr valve. These wires are for the position sensor and they go back to the ecm ( engine control monitor)< computer> James= 15 year Mazda tech just a tip= with engine COLD,reach under valve and press on plunger and see if it moves freely(not easy) but freely. Hope this helps.
There is a throttle position sensor mounted to the throttle body. That's the place where the air intake valve sits near the top of the engine. Look for the throttle butterfly valve; on the end of the butterfly valve shaft should be a little sensor with wires connected; that's the throttle position sensor.
A 2000 Mazda Protege with 1.8 DOHC engine appears to be a "free-running" engine, meaning there is no valve/piston interference in case the timing belt broke. There is enough clearance between the valve and piston, even if the cam stops (i.e. the timing belt breaks) with the valve fully open. Therefore, the car will not be damaged if the timing belt broke.