Mercedes 190e high idle and strange duty cycle

Hello everyone, I have a mercedes 190e 1988 2.0, and i have a idle problem which i suspect is from the O2 sensor. When the car is cold it idles about 1000rpm, but when it warms up the idle goes to 1500-1700rpm. I've been struggling to read the duty cycle of my car to read error codes so i can fix the idle problem. So when i connect a multi meter positive to pin 3 and negative on pin 2, on the 8 pin diagnostic port on my left fender, i read less than 0.1V. Neither when the engine is on... Mercedes 190e high idle and strange duty cycle

Hello everyone,

I have a mercedes 190e 1988 2.0, and i have a idle problem which i suspect is from the O2 sensor. When the car is cold it idles about 1000rpm, but when it warms up the idle goes to 1500-1700rpm.


I've been struggling to read the duty cycle of my car to read error codes so i can fix the idle problem. So when i connect a multi meter positive to pin 3 and negative on pin 2, on the 8 pin diagnostic port on my left fender, i read less than 0.1V. Neither when the engine is on...

Mercedes 190e high idle and strange duty cycle

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