Sorry been away pretending to work, Yes as clutch said as its got a sensor it will bring it up. It's either a faulty EGR or faulty sensor. What makes you assume its the EGR? Also slightly off topic does anybody know the connection type on the corsa B for an OBD 2 unit?
As said the Port may be blocked so the valve will still open but the gasses can't escape...so the sensor won't show a problem with the EGR valve but you won't get the recirculated gasses. It could alternatively be the thermo vacume valve no working properly. I'm unsure if that has a sensor on it?
Yeh that's probably exactly it it needs a clean. Just because it's dirty the mechanism is still working (so not setting off alarm bells with the ECU) but your getting no effect from it. 1st step would be to clean it up and see how it goes. Maybe deatschtye can either confirm or dispute that theory when he sees this.
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