Hi. I have a 2000 ford ranger 4.0. I had a couple codes come up with lean issues. Turns out the intake hose/boot was torn at the accordion. It was also running very rough at 4 and 5 gear. I replaced it and check engine light went off for a second and then I got another code for P0118. I replaced ECT sensor not the sender thinking it could be that. Still not fix. The truck runs very rough and wants to stall. Also has a very bad smell coming from the exhaust. It’s almost like the wrong type of air fuel mixture is not right. Could anyone help.

 

Welcome to the forum

ECT sensor has a light green/red wire and a grey/red wire

The Temp Sender uses red/white and black/white wires

P0118 can also mean this sensors 2 wires are shorted together

P0118 - Engine Coolant Temperature Circuit High Input

The computer sends the sensor 5volts
If it gets back 3 volts then engine is cold, 40deg
If it gets back 2 volts then engine is warming up, 100deg
.5-1volt is 190deg, operating temp

So p0118 means computer is getting more than 4volts, Circuit High input, not temp high, circuit high

The new sensor may have a short, it happens, or the wires are shorted together

 

I used a multimeter to check the voltage on the connector (disconnect) I got 4.50 volts. I connected back on the ECT and got a reading on 2.93.

 

I also noticed the wires were stripped and look a little corroded.