Some weeks ago, The Duchess started to ”miss” when cold: I put it down to the damp weather affecting the electrics. Yesterday, however, she randomly stuttered for a while longer than previously but, again, about 10 miles into the journey, seemed to behave.
Today, I thought I’d see if there were any DTCs. After running normally for a few minutes, revs randomly dipped to almost zero, the ”CHECK ENGINE” error appeared, then very briefly ”TRACTION CONTROL FAILURE’. Revs then returned to normal.
My ELM327+Torque app told me that there were ”No codes in ECU 0”, which didn’t seem right. I plugged in my other reader, a U480. That displayed only 1 pending code, P1797 which is a CAN error.
The battery is a brand-new Yuasa HSB019 - https://www.halfords.com/motoring/batteries/car-batteries/yuasa--hsb019-silver-12v-car-battery-5-year-guarantee-161078.html - less than a fortnight old with tight connections so I don’t think it’s the culprit.
As I also (still) have rev-related interference on the radio, I strongly suspect either a plug or plug lead breaking down.
What do we think?