It’s a common problem, when the T1N Sprinters get a little long in the tooth. The turbo resonator (pressure side) can start to split, causing loss of boost and the dreaded Limp Home Mode.

Mine was not exempt from this plight. Below are some example photos of what the Turbo Resonator looks like when failing. This example shows the common separation of along the bonding lines. During high boost this can open and cause the loss of pressure, power and then a CEL fault which the trucks ECU detects as a dangerous condition for the engine and cuts severely reduces power.

This is what the part looks like. It is connected directly to the outlet side of the boost section of turbocharger. The rubber o-ring seals to the turbos (pressue side, not exhaust / impeller side).

Closeup of the gap formed at the bonding point. I’m told this is the typical failure point. In a lot of case you wont’ be able to see this unless the motor is under boost. In my case, it looks like it’s been failing for some time, it probably why the seller unloaded the truck $2500 under asking price.

Another area that I’m told is possibly suspect fails is the outlet side. I didn’t see any signs of a failure here, but it’s something to check if you suspect you have this issue.

Another thing to look for is leakage around the o-ring. In this case there is crud around the area, but the ring appears in tact and no signs of blow-by. It turns out the crud was from the primary cause of my reliability issues, from a totally separate part.

Fortunately, this part is not really difficult to remove. A 1/4″ wrench or an E8 female Torx socket (later bring the correct tool) and remove too small bolts when it attaches to the alternator bracket and it’s removed.

Also of good news is that a good, reported very reliable by the Sprinter community replacement, is available on Amazon.com for less than $30.