VW T6.1
EA288 Evo Biturbo with 150 kW and Bosch injection. Most powerful diesel in the T6.1, successor to the CXEC.
Top Diesel T6.1
DMZA BiTDI with 204 hp and automatic is the best the T6.1 has to offer. Powerful and effortless.
Engine Weaknesses 5
The DMZA BiTDI 204 PS T6.1 shares its predecessor CXEB's weakness: the oil pump is undersized for the power output. Under full throttle the engine briefly runs dry; bearing damage threatens.
Symptoms: Power drop at full throttle, oil pressure warning, metallic knocking, increased oil consumption
DMZA BiTDI significantly revised compared to CXEB. With BiTDI there remains a generally elevated risk of piston ring wear under full load without a warm-up phase.
Symptoms: Oil consumption above 0.5 L/1,000 km, occasional blue smoke
High-pressure EGR retained. At BiTDI power levels, EGR loading increases. Significantly less common than on the CXEB.
Symptoms: Check engine light, power loss, limp mode
EA288 Evo: timing belt in oil bath for oil pump drive with no VW-specified replacement cycle. Strictly observe correct oil type.
Symptoms: Abrupt oil pressure loss on failure, check engine light
The DMZA 2.0 TDI BiTurbo (150 kW/204 PS, VW T6.1 from 2021) is considered improved over the CXEB/CXEC, but like all EA288 diesels shows EGR valve soot fouling at higher mileage. Short-trip use deposits soot in the EGR system.
Symptoms: Slight hesitation at low rpm, EGR fault code P0401, increased fuel consumption, rarely check engine light
Vehicle Weaknesses 9
Water ingress can cause Bowden cables in the door locking system to freeze in frost, creating a false lock. In the worst case doors open while driving. Recall 57H5/57I1 affects approximately 76,000 vehicles (build years 2019–2021).
The T6.1 electric sliding door uses fully electronic lock control with no mechanical backup. If the control unit fails — often due to a fully discharged battery — the door no longer responds.
Control arms made of unprotected grey cast iron as well as the underbody and cavities show initial rust formation after just 2–3 years. The factory sealant is considered inadequate. Professional corrosion protection is recommended immediately after purchase.
The diesel particulate filter only regenerates after approximately 15 minutes of motorway driving at over 600°C. With predominantly short-trip use, the filter fills up and from approximately 150,000 km causes knock-on failures. Oil dilution from post-injection possible.
The 7-speed DSG DQ500 in the T6.1 is prone to pull-away judder in combination with the 2.0 TDI and all-wheel drive, particularly during warm-up below 1,600 rpm. Software updates provided only partial improvement.
The lower sliding door guide rail rusts through water accumulation and paint abrasion from the running roller. Surface rust sets in from the first winter. A known serial issue since T5/T6.
The slotted rubber bushings in the front control arms of Multivan/Comfortline variants wear significantly faster than the solid rubber variant in the Transporter. Knocking noises sometimes from 20,000 km.
The MIB3 infotainment system in the T6.1 freezes or restarts every 2–3 minutes. Without a firmware update or hardware replacement the problem returns.
The Webasto auxiliary heater in the T6.1 Multivan shuts off after a few seconds on its own. Common causes: too weak an auxiliary battery, empty tank, or CAN bus communication errors. Safety lockout requires diagnosis and reset.