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We thought it might have been the variable vane in the solenoid/stepper motor, but replaced it, & it was still doing it. I think you are probably on the right track about the sustained boost while towing the caravan & the Map needing adjusting. Hopefully the mechanic will have some answers for...

Thanks for your comments. I am probably better off taking it back to the mechanic who did the remapping. Approx. 600km round trip. I have had contact on the phone & he is trying to find out what might be causing it. It appears to be over boosting at the time the light come on.

Hi, I had ECU remapping & a new 3" exhaust system put on my 2008 Toyota Prado Diesel in July 2016. In October we went on a 3 week trip with our 2011 Supreme pop top caravan. The Prado was going well & the extra power was worth the upgrade, until the 2nd last day when the engine light came on...

Various pictures my toys

My offroad trips

My build thread