Thomas Leah Posted July 25, 2020 Share Posted July 25, 2020 Cars throwing a P0198 code Engine oil temp sensor (EOT) high voltage. Changed sensor and still got a light and oil temp gauge won't go above 70°c. Also started after an ECU reset. The reset was because I had a Powerflow cat back fitted and it was throwing a miss fire code (car wasn't missfiring). The car hadn't been tuned yet and I was advised on sites and by tuners to reset the ECU. Now i have a new sensor the code won't even clear and the light stays lit up. Car feels sluggish at lower revs also but I've been told the EOT sensor helps the ECU with air fuel mixes so that explains that in my eyes I'm really stumped on this so any help would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 25, 2020 Share Posted July 25, 2020 Where did you buy the sensor? Was it genuine Nissan OEM? Quote Link to comment Share on other sites More sharing options...
Thomas Leah Posted July 25, 2020 Author Share Posted July 25, 2020 Express factors...it's a Bosch sensor Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 25, 2020 Share Posted July 25, 2020 Try your old sensor back in. Quote Link to comment Share on other sites More sharing options...
Thomas Leah Posted July 25, 2020 Author Share Posted July 25, 2020 It was an issue before the sensor change. Been playing and the code will clear now but the second time you start it after clearing it comes back Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 25, 2020 Share Posted July 25, 2020 If you are sure that the new sensor is good, then I would be looking at associated wiring or a bad connection. The engine oil temperature sensor is used to detect the engine oil temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine oil temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. Quote Link to comment Share on other sites More sharing options...
Thomas Leah Posted July 25, 2020 Author Share Posted July 25, 2020 I'm leaning towards ECU personally. Going to run a continuity test on the connections see what the crack is Quote Link to comment Share on other sites More sharing options...
Thomas Leah Posted July 25, 2020 Author Share Posted July 25, 2020 Am I right in saying if I've got a higher voltage going to the sensor it could be a short from another wire into the EOT loom or most likely the ECU is the issue? Because my car things it's cold that means the output of the sensor must be a higher voltage something like 4 volts plus?? Another theory could be on the return to the ECU another system could be shorting into the EOT wiring? Any of this sound logical Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 25, 2020 Share Posted July 25, 2020 If it was me, I would be fitting a genuine Nissan EOPS as they are only circa £40.00. Do you not have a mate with a similar car that you could swop out his sensor as a process of elimination? Quote Link to comment Share on other sites More sharing options...
Thomas Leah Posted July 25, 2020 Author Share Posted July 25, 2020 No I'm the only Z in the area unfortunately. Quote Link to comment Share on other sites More sharing options...
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