P052E has a source-scoped interpretation in a manufacturer document. Check the raw form, vehicle conditions and original bulletin before using it.
This meaning belongs to the cited manufacturer document and its conditions. It is not a universal code definition, a VIN-specific match, a driving clearance or a parts diagnosis. Independent safety review remains pending.
This Mercedes-Benz document supports only its stated code and vehicle context. The code alone cannot identify a failed part, prove that another make uses the same definition, or clear a car for driving. Compare your full scan with the current exact-vehicle service information.
Read the Mercedes-Benz original: M274 crankcase-ventilation P052E71 and model-dependent remedies Source date: 2025-01-17; research checked: 2026-11-01.
What the manufacturer document says
The same root can have a different meaning or role in another module or vehicle. Preserve the full raw code and suffix rather than applying this table to every car.
| Raw form | Meaning in source | Document | Case context |
|---|---|---|---|
| P052E71 | Crankcase-ventilation regulator performance malfunction; retain suffix 71 in this Mercedes application. | Mercedes-Benz LI01.20-P-076894 version 7 | Mercedes M274 P052E71: model-specific ventilation repair branches |
Vehicle scope recorded in the source
- Mercedes-Benz M274-equipped passenger cars · year not established · M274; VIN/engine and individual branch required
- Mercedes-Benz SLK 300 / SLC 300 · year not established · M274; Special intake-line/diagnostic branch
- Mercedes-Benz C 350 e / GLC 350 e · year not established · M274 hybrid; Special intake-line/diagnostic branch
What to record before clearing the code
- Record the exact suffix 71 and the vehicle engine/hybrid identity.
- Note other codes and the exact dashboard message; a generic reader may miss the affected module.
Questions before a repair or part order
- Do not unplug control wiring as a DIY emissions workaround or assume an oily connector condemns an ECU.
- Does the current manufacturer document cover this VIN, engine, build date and symptom?
- Is a recall, warranty or newer service communication relevant? A bulletin alone is not free-repair eligibility.
How to use this research note
The source document is historical and may have a later revision. Its cited vehicle table is a condition to verify, not a complete list of affected VINs. A code can be secondary to another fault. If braking, steering, propulsion, temperature, smoke, fuel or high-voltage behavior is unsafe, stop safely and seek qualified help rather than using this page to continue driving.
Sources and scope
- Mercedes-Benz — M274 crankcase-ventilation P052E71 and model-dependent remedies (LI01.20-P-076894 version 7) Document: 2025-01-17 · Research checked: 2026-11-01
Research snapshot: 2026-11-01. Source documents may have newer revisions. Verify current instructions and VIN eligibility with the manufacturer.