Hi everyone 

Been getting the SVS service message coming up with P0030-00 HO2S heater control circuit sensor 1

I’ve just replaced the lambda sensor for an identical part, cleaned the egr, throttle body and map sensor yet the fault won’t go away. 

Any ideas of what this could be? Don’t really want to go to a garage and get raped of it could be this it could be that. 

Many thanks.

Have the 'Service Soon' message popping up intermittent on my Astra J 2001 2.0 Diesel, and the fault codes read are:

P0087 - Fuel Rail - Too Low Pressure - Unrecognised State
P0399 - Cylinder 1 Pressure Sensor Circuit - Malfunction - Faulty Function

The car  seems to drive OK, no general loss in power but am noticing when changing gears the engine revs seem to overun if the gas is less off when the clutch is down.  i.e. if chaning at 3,000 rev, and i put the clutch down and let off the ga