A fairly local family from Northampton in today with their Discovery 3 TDV6 with EGR Valve problems causing poor performance and the Engine Management light to be on permanently which is a MOT failure.
A new EGR valve is expensive to buy and awkward to fit and will only fail again! So the sensible option is to have the ECU remapped and the EGR valves deleted via the software and also blanked mechanically with an EGR blanking kit DA1112.
By deleting the EGR’s via the software, the operation of the EGR valves is omitted and as far as the car is concerned it no longer has EGR valves fitted so they will not operate and will not throw up a fault code when one of the valves fail which they inevitably will do! There is no MOT requirement for the EGR Valves and it will not affect the emissions test at all.
The other advantage of having a remap is, of course, the gain of extra power and more importantly torque. See the screenshot below for typical power and torque gains for the Discovery 3 2.7 TDV6.
Whilst with us they also wanted an automatic ATF gearbox flush carried out as the car has done 90,000 miles and per Land Rover’s service schedule, the gearbox has never been serviced. So an hour later the gearbox was flushed of all old, worn out fluid and replaced with fresh new fluid that should be good for another 80-100,000 miles.