Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
Has a Holden Tech looked at your car, or just a normal garage mechanic?
The Holden TECH2 scan tool or laptop equivalent shows more data than most other tools.
My bet is you have a faulty EGT sensor, exhaust gas temperature.
I have seen this concern many times.
Do you need any further help?
I hope my advice has been of assistance to you.