Hi Peter, We had exactly this fault on our Grand AWD at 400km (almost brand new). We took it back to the dealer (twice) and they found after an hour that a vacuum hose was "incorrectly fitted" in the engine bay (a leak basically). The problem on the Toyota T2 diagnostic hand-held machine also showed an exhaust o2 (oxygen) sensor problem - caused by the vacuum hose affecting the fuel/air mix - nothing to do with the exhaust at all. Take your Kluger straight in and ask your service guys to phone the service guy Mark at Toyota in Frankston and ask his team what they found on ours. It could save them a lot of time an get you happy again. Glad to be of help. LC.