Toyota Aqua 2016 Problems & Solutions

so i think i found the culprits.

Frequent EV running:



I am still not sure how it got this dirty despite being serviced not more than 15k KMs ago.

Anyways, disconnected the 12V and the HV batteries to let the car "reset" (if it even happens), removed and cleaned the fan unit and the issue of excessive engine running is completely solved. EV mode kicks in and stays as soon as it can and for as long as it can. No excessive engine running when parameters are favourable e.g. coolant temperature, battery state of charge, heating requirement etc.

Engine Missing / Shudder:



I think i overused this set of spark plugs (about 120k KMs) ?

Could not source the OEM plugs immediately so temporarily put in a Chinese aftermarket iridium set. This has handled about 70% of the missing /shudder. I think the remaining 30% should be handled once i put in the OEM set?

Need guidance on whether i need to check the health/function of ignition coils as well? If yes, how? Any chances of those getting damaged due to the overused plugs?

During this activity, when i plugged in the VCI for the first time about a week ago, TechStream had stored a P0172 - System too rich in history. I cleared it and it did not return. Just wondering if i need to do something or at-least check the fuel injectors? How?

Thanks.

 

Yes