"Is the Gla 220d reliable, and what should you check?"
When buying a used 2018 Mercedes-Benz GLA 220d (156 / facelift), the most frequently mentioned issue is timing chain stretching/wear. Additionally, EGR valve and recirculation channel clogging and failure are also commonly reported.
Engine: OM651
OM651.930 · diesel · 220d · Used in this car from 2015-2019
Strengths
Decent lifespan with proper maintenance
Modest fuel consumption for such power
Watch-outs
Finicky Delphi fuel system
Frequent bearing shell rotation
Low timing chain tensioner lifespan
Known engine issues
Fuel systemUntil 2011, main versions used Delphi fuel system with piezo injectors prone to leaks, often causing hydraulic lock and piston burn-through. A recall was even issued to replace them with simpler electromagnetic ones. Engine modifications with Bosch fuel system have no reliability issues.
Bearing shell rotationMany owners of vehicles with this diesel have encountered bearing shell rotation. The cause is dilution of overheated oil due to clogged heat exchanger or oil pressure drop from variable displacement oil pump failure. The engine also lacks a standard oil pressure sensor, but one can be installed.
Timing chain hydraulic tensionerThe combined timing drive consists of a roller chain and several gears. The chain can last up to 300,000 km, but its hydraulic tensioner often fails much earlier, and replacing it is quite labor-intensive and expensive.
Listed from most frequently reported, each with its source.
Timing chain stretching/wear
Often reported
In some versions of the 2.1 diesel engine (OM651), early stretching of the timing chain or noise from the timing area is reported. Stretching can cause metallic sounds, reduced performance, and if left untreated, risk of more serious engine damage.
Timing chain
EGR valve and recirculation channel clogging and failure
Often reported
In the 2.1 diesel engine, carbon deposits tend to form in the EGR valve and exhaust gas recirculation channels. These deposits reduce flow, cause diagnostic errors, and trigger the warning light. Deposits can negatively affect DPF regeneration and may lead to limp mode.
Exhaust Emissions
Turbocharger failures and related oil leaks
Often reported
Technical reports on the OM651 engine indicate wear or failure of the turbocharger, often accompanied by oil leaks at the turbine connections or lubrication pipes. Deterioration can cause power loss, exhaust smoke, and abnormal noises.
Turbo
Mercedes-Benz Gla 220d technical specs
Mercedes-Benz Gla 220d (2018): boot 421 L; fuel use 4,4 l/100 km (urban 5,2 l/100 km · extra-urban 3,9 l/100 km); 0–100 in 7.7 s.
Boot capacity
421 L
Fuel consumption
4,4 l/100 km (urban 5,2 l/100 km · extra-urban 3,9 l/100 km)
What should I look for when buying a Mercedes-Benz GLA 220d?+
When buying a 2018 model 220d, check the service history, test drive, and look for engine/transmission warnings. The most commonly reported issues are: timing chain stretching/wear; EGR valve and recirculation channel clogging and failure; turbocharger failures and related oil leaks.
What are the common problems of the Mercedes-Benz GLA 220d?+
The most frequently reported issues are: timing chain stretching/wear; EGR valve and recirculation channel clogging and failure; turbocharger failures and related oil leaks.
Is the Mercedes-Benz GLA 220d reliable?+
Rather than a simple yes or no, it's best to weigh the proven pros and cons together. This page lists 3 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from Difetti fault database records; the source vehicle and target vehicle are verified for brand, fuel, engine, and generation compatibility. Topics with insufficient evidence are not shown.