corsa is sluggish

[angierobb1]

can anyone help my v reg corsa 1.2 is very sluggish and sometimes cuts out when u start driving ive changed the erg valve. full exhaust system including cat also new co2 sensor water pump and im still having problems thats my first question.
2nd question my management light keeps coming on had it all reset when got the new o2 sensor and cat was fitted but when i go over 60mph or go up a hill the light comes on and then the car becomes limp
please can anyone help

 

[jonnyfishing]

Have another readout done and see what comes up. Probably the cheapest way in the long run.

 

[Burnerman]

I'm wondering if the lambda sensor was a genuine item or a pattern part - if the diagnostic still comes up with a generic 02 sensor issue then I would expect so. Are there 2 sensors on these?
John

 

[angierobb1]

Have another readout done and see what comes up. Probably the cheapest way in the long run.

the 02 sensor was new and an original vauxhall part any other suggestions

 

[wotan]

might be obvious but have you checked the spark plugs, and air filter?

Wotan

 

[Belle427]

maf sensor too (airflow meter) you can disconnect it and drive the car, if its better then its knackered