Vauxhall Zafira warning light on at motorway speed

Possibly DPF ? Here is some probs with this on same car .

http://www.rac.co.uk/forum/showthread.php?t=9531

i had the dpf and differential boost pressure replaced a few months ago,the car was fine 2 weeks ago,i went on holiday and the car was left standing at the airport for 12 days,this is when the fault occured when i drove home down motorway,could it just be a glitch in the system?

Strange , if anything you would have thought a blast down motorway would have helped .No fault codes ? As you say , could just be a glitch , fingers crossed .

Forgot to say , does "a soft ware update needs to be done so it rege3narates if needed " in the RAC thread not apply to this fault ?

i have managed to get the fault codes read by tech 2 and it is coming up with P242f - particulate filter pressure sensor signal range/performance,i had a new dpf and differential pressure sensor fitted 2000 miles ago,on contacting vauxhall i was told that the dpf is regenerating itself when the light comes on and that i need to drive at a constant speed till the light goes off.any ideas how long i need to drive the car and at what speed?

hi
soon as i switch my engine on there is warning light on speed 60 with a sppaner on even though i never took it to the motor way i have just bought it a week ago iam a new passed driver i am so worried is it serious fault