PLEASE HELP - Astra AH Heat & Limp Mode

[shtevo]

Hi everyone,

I am very well aware that asking for help on your first post in a forum isnt the most awesome thing to do,
but I am short on resources, time & good quality information.

I am extremely active on other car forums, and know that some very smart people lurk around these places.

Which is why i have come here.

My fiances car...
2006. Astra AH. Turbo. 70,000kms. no mods.
I have wasted money and left mechanics pulling their hair out over this one.
Normally happens in the warmer months, car goes into limp mode with the CEL on. Kinda randomly, out of no where, she'll drive to the shops fine - then when she leaves - it goes into limp.

It has been plugged into numerous scanners...

Accelerator Pedal position = We changed the pedal
Steering Assist Sensor = We changed that too
All using original Holden/GM parts

No one seems to know how to fix this & were throwing cash at this car with no results.

Could someone here please help me or recommend me to a genius mechanic.

Again, sorry for making my first post a question.

Any help & feedback is greatly appreciated.

Thanks

[guy 27]

Where are you located?

[shtevo]

Northern suburbs of Melbourne

[guy 27]

Nurb608 will be able to recommend someone.

[Nurb608]

Hey mate,

If you are near Thomastown/Campberfield, have a chat to Greg or Danny at Monaro Performance Centre. Link to their website is in my signiture.

Those codes are strange ones, never really seen them before but these guys look after a few Astras so should be able to help.

[dutchy]

Have you also checked your cam sensor ? See if the bolt is tightened.

[Wraith]

If all else fails to rectify the problem it'll be the ecu is faulty/damaged...

I know another person with a TS Astra sedan with the same symptoms, end up having to get the ecu replaced...

[shtevo]

Thanks for the help & feedback.

Was hoping that someone here has experienced this & would be able to diagnose it instantly.

I have read somewhere online that a faulty ECU could be the culprit, but that would mean that the problem would be visible in winter as well as summer.

Ive been thinking something along the lines of Thermostat, but thats just me taking blind guesses.

Still stuck & confused :(

[dutchy]

Points to a sensor and not the thermostat. Cars heating up normally and thermostat opening ?

[Jonski]

maybe one of the o2 senors?
has the exhaust been modified at all?

[dutchy]

maybe one of the o2 senors?
has the exhaust been modified at all?

o2 sensors wouldnt give those error codes.

[shtevo]

No mods,
car is stock.

Id like to have some sort of idea what it could be before it goes to the mechanic next week.

Thanks for feedback so far guys.