Citroën Relay EGR delete
Coolant dropping with no leak underneath, white smoke on a cold start, then limp mode on the way to the first drop. On a 2.2 HDi Relay that is the EGR cooler. Mobile software delete at your location, £220.
Call 0161 694 7331. We come to you within a 40-mile radius of Eccles.
For off-road and track use only.
How the EGR fails on a Relay
On the 2.2 HDi, the cooler cracks. The 2006 to 2016 Relay's 2.2 is a Ford-derived Duratorq, the same family as the Transit of those years, and it goes the same way. The EGR cooler sits in the exhaust gas path and cracks internally with age and mileage, so coolant seeps into the intake and burns off in the cylinders. The first sign is the header tank going down with no puddle and no wet hose. Then white or grey smoke on a cold start, then the engine management light with P0401 or P0402 stored, and eventually limp mode.
On every Relay, the valve sticks. Multi-drop work never gets the intake hot enough to burn soot off, so carbon builds on the valve until it stops seating. The ECU sees a flow figure it cannot reconcile and logs P0401, P0402 or P0404, with no coolant loss at all. On the 2.0 BlueHDi there are two valves to foul, one on each EGR loop.
Relay engines covered
Relay 2.2 HDi, 2006 to 2016
The Ford-derived 2.2, in 100 to 150 PS outputs across the years. Cooler cracking and valve sticking, in that order of cost.
Relay 3.0 HDi, 2006 to 2016
The Iveco F1C, shared with the Ducato 3.0 and the Daily. Cooler and valve faults.
Relay 2.0 BlueHDi, 2016 to 2019
The PSA DW10, with a low-pressure EGR loop as well as the high-pressure one. Valve sticking on either loop.
Relay 2.2 BlueHDi, 2019 onward
A new Stellantis 2.2, not the old Ford-derived unit. Newer, shorter record, same remap.
The Relay is the same van as the Peugeot Boxer and the Fiat Ducato. See Citroën EGR delete for the rest of the range, or call 0161 694 7331 for a variant not listed.
What the delete does to that fault
The delete answers both failures at once. The ECU stops commanding the EGR valve, so a valve stuck with carbon can no longer produce the flow error that puts the Relay into limp mode, and there is nothing left to log a P0400-series code against. The EGR circuit is closed in software, so exhaust gas stops passing through the cooler, and a 2.2's cooler that has been weeping coolant into the intake stops being fed. On the BlueHDi both loops are handled the same way. Valve, cooler and pipework stay on the van and stop being used. Codes cleared, and the remap is permanent.
Is it definitely the EGR?
Three things help us confirm it on the phone. The exact codes from a code reader. Whether the coolant is dropping without a visible leak. The smoke: colour, and whether it is only on a cold start. If coolant has been entering the engine for months, the delete stops further ingress but does not undo damage already done, and we will say so on the day rather than remap a van that needs something else first. If a DPF light is on as well, both are handled in the same visit for £445: see DPF and EGR delete.
Questions Relay owners ask
Is it definitely the EGR, or could it be something else on a Relay?
My Relay has been losing coolant. Will the delete stop it?
Does the delete cover the EGR cooler on the Relay as well as the valve?
Will the fault codes come back on the Relay after the delete?
Other Citroën models we cover
Pick your model:
Call 0161 694 7331 with your Relay's engine and the fault codes you have, and we will confirm the fix and a time.
£220, we come to your yard, site or depot anywhere within a 40-mile radius of Eccles, no call-out charge, no strip-down, and the van stays put. For off-road and track use only.