Mercedes C-Class EGR delete
Motorway miles all week, the airport rank at the weekend, then a second life on short trips. The use that fouls a C-Class's EGR is the use we come out to.
Mobile software delete, £220.
For off-road and track use only.
How the C-Class gets used
A diesel C-Class has two lives in the North West. The first is as a company car or a private-hire car: a C220 CDI on a three-year lease doing long motorway stints, or a C220d on the rank at Manchester Airport, idling between fares. The second life starts when the car comes off lease or off the plate at 100,000 miles and goes to a family in Stockport or Wigan, where it does the school run and the supermarket.
The first life fouls the EGR slowly and the second finishes the job. Idling at a rank keeps the intake cold and coats the valve with carbon. Motorway running masks it. Then the car moves to twenty-minute trips across town, the intake never gets hot enough to burn the deposits off, the valve sticks and the ECU cannot reconcile the flow it sees with the flow it asked for. On the OM651 there is a second failure underneath that one: the cooler cracks, coolant seeps into the intake and the level drops with no leak to find. Either way the engine management light comes on and the car drops into limp mode on a slip road.
What changes after the delete
The ECU stops commanding the EGR valve, so a sticking valve can no longer put the C-Class into limp mode. Exhaust gas no longer passes through the cooler, so the coolant-loss route through a cracked OM651 cooler closes. No EGR fault codes, no repeat valve bill, no cooler at dealer rates. The valve and cooler stay in place; nothing is removed and nothing is ordered. The car stays where it is parked for the visit and is back in use the same hour. Fuelling and power stay as Mercedes set them.
C-Class engines we cover
C200, C220 and C250 CDI W204: OM646 to 2009, OM651 2009 to 2014
Early W204s carried the OM646 2.2, a valve-sticking engine. From 2009 the OM651 2.1 took over, the same unit as the Sprinter and the GLC, and it brought the cracked-cooler fault with it. Both covered.
C320 and C350 CDI W204: OM642 3.0 V6, 2007 to 2014
Cooler and oil-cooler leaks, valve faults alongside. Buried cooler, expensive to reach.
C220d and C250d W205: OM651, 2014 to 2018
The same OM651 in the newer body. Same cooler, same coolant loss, same fix.
C200d W205: OM626, 2014 to 2018
The Renault-derived 1.6 R9M under a Mercedes code (OM626). A valve that sticks at relatively low mileage.
C200d, C220d and C300d W205 and W206: OM654, 2018 onward
The OM654 2.0 arrived with the 2018 W205 facelift and carries into the W206 as the OM654M. Newer, twin-circuit EGR, shorter record so far.
Anything not listed, call 0161 694 7331 and we will confirm. Every Mercedes we cover is on the Mercedes EGR delete page.
More than one C-Class
Private-hire and executive-hire operators often run three or four C-Classes alongside E-Classes and V-Classes. We can work through them in one visit at your yard or office and fit the appointments around bookings and shift patterns, so each car is off the job for about an hour and no longer. It is £220 per vehicle. Send us the reg of each one before the visit and we will confirm the engine and ECU type in advance.
Questions from C-Class operators
Can you come to a site, depot or farm to do a C-Class?
I run more than one C-Class. Can you do them in a single visit?
How long is the C-Class off the road for?
Can you do the DPF and the EGR on the C-Class in the same visit?
Other Mercedes models we cover
Arrange a visit for your C-Class: call 0161 694 7331, tell us where the car is and when it is off the job.
It is £220 per vehicle, we come to you anywhere within a 40-mile radius of Eccles, and same-day and next-day slots are common. No call-out charge, no strip-down, nothing removed from the car.
For off-road and track use only.