Does my dad's car need a new ECU?!

Done the pedal test on my dad's 2001 Opel Astra (it was running slow and drinking petrol) and got the codes p1122, p1120 and p1155; we were told these are to do with the car's computer and will cost in the region of €1,000 to replace the computer and reprogram. Is this correct or is it easily fixed?

Maebh Bushe (Dublin)

Mar 2013 Filed under: fault

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Expert answer

Hi Maebh,

Codes P1122 and P1120 relate to the accelerator pedal position sensor, but we can't find P1155. It should be possible to just change the accelerator pedal assembly rather than the whole computer going on that information, unless P1155 means something else entirely of course.

Shane O' Donoghue - Complete Car Advisor
@Shane_O_D