2012 IQ rough idle when in drive or reverse

It's possible that one or more of your speed sensors or wiring harness may have been damaged. It's also a possibility that the sensor ring could be damaged as well.

Perusing one of the Facebook groups and it's possible that the O2 sensor may be cracked or damaged.

Thanks for looking into this, I brought my car to another local garage and am now waiting for a diagnosis. Let’s see what they come up with. BTW, wouldn’t the OBD scanner pick that up?

Thanks for the feedback, is this the probe that inserts into the exhaust pipe ? Do you have a pic or a PN?

Thanks for that info, I will check it out and let you know.

Have you tried doing an idle relearn procedure?

Yes I tried that.

Things seem to be getting worse. Aside from the traction control light now lit, I put the car into S mode and there was no indicator on the dash of what gear I was in, I had to pull over and put the car in neutral and to get it back into drive, then it wouldn’t shift. I’m thinking maybe a speed sensor.

It almost sounds like something happened to the shifter cables going to the transmission. Have you had a chance to inspect the car from underneath?

Back in the day I had a 1995 Honda Civic with a manual transmission that got a rock physically stuck in the shift linkage bars after driving down a dirt road. I couldn't shift into 3rd or 5th gear until it worked its way out.

I wonder if your cable linkage is jammed, bent or loose in someway. Basically you're not getting true engagement to whatever drive mode you attempt to select.

That might explain why S mode disappeared on the dash display. The lack of correlation between the physical gear selector and ECU expected operation might explain the TCS light and rough idle too.

✌

Yes I checked it and it’s behind the engine so I doubt if anything got rammed up there.