...after fitting a new cat to an 02 Vectra sri150 estate - only replaced the front lambda, took the rear one out, cleaned it and put it back in the new cat.

All was ok for week, then misfiring, bad starting for a week - that cleared up ok by itself, then the light came and stayed on....thing is, the car seems to be running ok, apart from the light.

thanks for reading

Ted, April 2009

could be the EGR Valve mate .. I have a 2.2 sri . light is also on . changed egr valve 2 years ago . every thing sound since . 3 months ago light came back on . went on tech 2 machine . came back . front lambda sensor . changed . back on tech 2 . came up back lambda sensor . changed that . back on tech 2 . got told the crank shaft sensor . changed that . now been told its the EGR valve so going to change that at weekend and if that fails you can have it for £ 1 ..... LOL

MICKY JONES, April 2009

Hi there the light has come on to tell u there is a problem and management system has maybe overcome this problem by altering settings which could result in less mpg or performance.
If after having reset management light it comes on then problem is still there and will have to be addressed.
Always fit things in pairs ie shocks brakes or sensors.
Management system has to learn new settings and can take up to 200miles to do so
Hope this helps

Paul.G, April 2009