M274 family fuel architecture, cylinder layout, displacement class, application scope and measurement-led diagnostic framework.
QUICK TECHNICAL ANSWERS
What concrete information can you get from this page?
Verified application example: Europe · 2012–2014 · Mercedes-Benz C 180 BlueEFFICIENCY · M 274 E 16 DEH LA / 274.910, 1,595 cc · application-specific; verify VIN/build data
VERIFIED FACTModel / system fact
Mercedes-Benz lists the M 274 E 16 DEH LA / 274.910 designation, inline-four layout and 1,595 cc displacement for the C 180 BlueEFFICIENCY application.
FAULT SEPARATIONWhen a symptom appears
For low power, record boost target/actual, throttle/load, supported fuel-pressure data and ignition/misfire counters at the same load point; do not collapse turbo, fuel and ignition paths into one parts guess.
FIRST MEASUREMENTBefore replacing parts
Confirm VIN/model year/market and the exact M274 sub-code first; do not transfer 1,595 cc M274.910 values to a 1,991 cc application or vice versa without matching vehicle identity.
M274; petrol_turbo; 4 cylinder/layout; 1595-1991 cc class
What to verify before ordering parts
Do not treat the family name and sub-code as identical; separate production period and market variant.
Emissions level, turbo/injection hardware and sensor/actuator generation can vary inside one family.
Transmission, hybrid system, ECU software and vehicle class can change the service procedure.
Diagnostic approach
Narrow faults by combining mechanical condition, air/fuel flow, pressure, temperature, lubrication, electrical supply and ECU commands rather than using the DTC label alone. Comparing loaded live data with idle measurements is particularly valuable for intermittent and performance faults.
ENGINE DIAGNOSTIC FLOW
Measurement sequence
Confirm exact engine code and application by VIN/model year/market.
Check power supply and ECU communication.
Capture air, fuel/energy, temperature and lubrication data at the same load.
Compare commanded values with physical result.
Verify under the same load after repair.
Source-verified powertrain relationships
No curated engine-transmission relationship is present in the source graph for this family yet. Exact fitment is not inferred.
OEM EVIDENCE DOSSIER
Verified technical facts and application boundary
Mercedes-Benz lists the M 274 E 16 DEH LA / 274.910 designation, inline-four layout and 1,595 cc displacement for the C 180 BlueEFFICIENCY application.[S1]
The same C 180 record confirms turbocharging, BlueDIRECT direct injection, two variably adjustable overhead camshafts and chain camshaft drive.[S1]
The Mercedes-Benz E-Class Coupé archive documents 1,991 cc four-cylinder M274 BlueDIRECT applications in the E 200 and E 250 at 135 kW and 155 kW respectively.[S2]
The E-Class source states that these M274 applications met Euro 6 and could be paired, depending on application, with a six-speed manual or 7G-TRONIC PLUS.[S2]
Verified application matches
The matches below are published only within the stated market, model-year and evidence scope. Fitment is not extrapolated to uncited variants.
Market: Europe
Model year: 2012–2014
Model: Mercedes-Benz C 180 BlueEFFICIENCY
Engine: M 274 E 16 DEH LA / 274.910, 1,595 cc
Transmission: application-specific; verify VIN/build data
Evidence scope: Mercedes-Benz public archive C-Class W204 application
Market: Europe
Model year: 2013–2016 model family record
Model: Mercedes-Benz E-Class Coupé E 200 / E 250
Engine: M274 BlueDIRECT, 1,991 cc
Transmission: 6-speed manual or 7G-TRONIC PLUS depending on cited model
Evidence scope: Mercedes-Benz public archive C207 facelift range
System architecture and component relationships
After confirming M274 sub-code and displacement, split diagnosis into turbo air path, direct-injection/fuel supply, variable cam timing and ECU-control layers.
Because the M274.910 source confirms variable dual overhead camshafts and chain drive, cam-correlation complaints should separate electrical actuation, phase feedback and mechanical timing.
The E 200/E 250 powertrain record shows that transmission pairing can vary within M274 applications; torque/shift complaints require exact application plus ECU/TCU context.
DTC / SPN-FMI / symptom discrimination map
For low power, record boost target/actual, throttle/load, supported fuel-pressure data and ignition/misfire counters at the same load point; do not collapse turbo, fuel and ignition paths into one parts guess.
For cam-correlation or timing DTCs, separate lubrication condition, cam command/feedback and mechanical timing evidence; do not replace a chain or actuator from the DTC label alone.
For shift complaints, account for application differences such as E 200/E 250 pairings and time-correlate engine torque-reduction commands with real transmission slip/ratio evidence.
Measurement and diagnostic strategy
Confirm VIN/model year/market and the exact M274 sub-code first; do not transfer 1,595 cc M274.910 values to a 1,991 cc application or vice versa without matching vehicle identity.
Synchronize supported boost, load, fuel-trim/pressure, cam-phase feedback and misfire data at cold start, idle and the same road load; PID names and service limits must come from the application-specific OEM source.
After repair, recreate the original temperature/load condition and confirm that command-versus-actual deviation, DTC state and the drivability symptom are resolved together.
Exact pinouts, torque values, pressure thresholds or service limits are published only when explicitly verified by the applicable OEM service source.
On turbo-petrol architecture, load calculation, boost target/actual, lambda/fuel trim, ignition and knock control are compared in the same event window.
Live data to capture for this family
Freeze frame: first/last fault time, RPM, load, vehicle speed, system voltage, core temperatures and companion DTCs.
Live data: calculated load, MAP/boost target-actual, throttle angle, lambda/O2, STFT/LTFT, ignition advance and knock retard.
Engine measurement chain
1) Match vehicle/generation/market/powertrain/driveline identity to the source record; family name alone is not fitment evidence.
2) Preserve freeze frame and companion DTCs before clearing; make the first-fault condition reproducible.
3) Verify power/ground and network communication under load; do not decide from key-on static measurement alone.
4) Compare commanded air/fuel/pressure with an independent physical result; separate sensor bias from real performance loss.
6) After repair, recreate the same load/temperature and verify DTC state, live-data deviation and user symptom together.
This section is an architecture-safe diagnostic layer derived from family identity; application-specific OEM limits are shown only when a verified evidence dossier exists.
Engine root-cause split
On lean/misfire/boost complaints, align fuel trim, lambda, ignition retard and boost deviation on one time base to separate air leak, fuel-delivery and ignition causes.
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