Thread: EGT probe ressistance

Hi, anyone knows aproximately what reading should i get if i check the resistance of the EGT probe measuring from the gauge connection? , i presume it's a kinda NTC sensor and today it stopped working after it started to give ultra high readings on almost no throttle, i checked instantly live data with nanocom and no problems also the manifold didnt glow so i presume the probe has gone.... i'll make some investigations tomorrow and just wanted to have an ideea cos if i find open circuit i think it's clear.

I have a similar issue. I thought i kept going through probes because i've got mine before the turbo and it may get hotter on average than putting it after the turbo.

Another test you can do is to check the gauge itself. With my gauge i can disconnect the probe and ground one of the prob input wires and the gauge reads about 1/3 scale.

My probe reads about 0.4 ohms from memory at ambient temp. I'm pretty sure it increases resistance with temp increase, but cannot remember how high i got it to read, probably something like 20 ohms.