For the last years I've been hunting for a intermittent fault where my engine cuts out aggressiveley (possibly boost cut or some torque limiter). More info on that is in this post: https://rsmegane.com/threads/intermittent-power-loss-engine-cut-missfire.14706/ Now I've upgraded the Torque app abit and found some irregularities, missfire count goes up into the hundreds after a 30 minute drive. However, it only counts the misfire on throttle lifts into engine braking or shifting - and especially at low rpms. No missfires felt/heard or any seeming loss of power. Knock counts are also high (attatched screenpic show historic values) and there is one cylinder that is significantly lower than the other ones. Cylinder four is significantly higher. Accounting for mileage of the car I get approximatley one knock every 20km or so, and the numbers seem to be rising at that rate. My question is: shouldn't off throttle misfires be impossible? Are missfires counted using the TDC/crank sensor - and if so, could it be faulty? Could it be that the car drops a bit of fuel to make the pops and bangs that throws it off? (on standard map).. Or could there be a problem with crank case ventilation which affects crank speed on throttle lift? Other known variables: 1. Front o2 sensor heat shielding has dried up and perished, didn't think it would affect much but I did get some wierd readings last night. Will keep monitoring. 2. Coolant temp sits comfortably between 80-84 degrees Celsius. Which seemed low but from what I've read the thermostat should open at 83-84 degrees? 3. Throttle opening on cold start idle is 17%, and on warm idle slightly below 14% 4. Running an ecu test i get a "fail" on "catalyst monitor bank 1" (secondary o2 sensor?) but I'm unsure what the Count represents. (see second screenshot) No other known issues, gas mileage very acceptable for my driving style.