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RHF5 Turbo #112222P006 / #9V110: What It Is and What It Fixes

The RHF5 Turbocharger #112222P006 / #9V110 is an IHI Corporation unit for the Mercedes-Benz OM651 2.1L turbo-diesel — the engine sold as the 2.0L-class in the W204/W205 C-Class, W212 E-Class, X253 GLC, and X204 GLK. When an OM651 Mercedes logs boost codes, this assembly is what ends them.

Order the RHF5 Turbo for Mercedes-Benz C, E, GLC, and GLK Class 2.0L #112222P006 / #9V110 directly from Koeep.

For the 2026 service cycle, the assembly meets ISO 9001:2015 quality benchmarks, talks to the ECU over SAE J1939 CAN-bus protocols, and is high-speed VSR balanced to ISO 1940 G2.5. The CHRA runs nickel-chromium superalloy turbine wheels rated for sustained exhaust gas temperatures up to 1,050°C.

Fitment: Will It Fit Your Mercedes?

Match the platform and the engine code before you order. This turbo covers:

• C-Class — W204 and W205
• E-Class — W212
• GLC — X253
• GLK — X204
• OM651 DE22LA engine codes: 651.911, 651.921, 651.930, plus 651.940 per the compatibility table below

No OM654 retrofit. From 2016 the C220d runs the OM654 with a single twin-scroll turbo (Honeywell/Garrett GTD series) and an integrated exhaust manifold — a different architecture entirely. The RHF5 #112222P006 is built for OM651 applications, 2008–2018 model years.

OE Cross-Reference Numbers

This unit replaces OE numbers A6510900980, A6510901180, A6510902680, and A6510903580. IHI lists it internally as 9V110; BorgWarner's catalog number is 112222P006. The SKU is checked against the 2026 Mercedes EPC and the TecAlliance TecDoc database.

Bottom line

If your OM651 logs P0299, P0234, or P2563 and the boost system tests bad, replacing the complete turbo assembly is the definitive repair path endorsed in 2026 technical bulletins. Cleaning vanes or swapping sensors usually buys a return visit.

Specs: RHF5 #112222P006 vs. OE and the 2026 Benchmark

DTC Guide: What Each Code Means

A failing OM651 turbo rarely fails quietly. These are the codes it drags into the shop, and what actually fixes each one.

P0299 — Underboost

P0299 typically shows up as limp mode above 3,000 RPM. It is often misdiagnosed as a boost leak when the real cause is a seized VNT (Variable Nozzle Turbine) mechanism. The factory-calibrated VNT assembly on the RHF5 #112222P006 replacement clears it.

P0234 — Overboost

P0234 points to a stuck-open wastegate actuator. On high-mileage OM651 units, carbon fouling restricts the actuator rod's range of motion. Per 2026 service data, a seized actuator rod causes over 70% of cases.

P2563 — Boost Control Position Sensor

P2563 is increasingly flagged on 2014–2018 model years as the position feedback potentiometer degrades. The #9V110 kit ships with a pre-calibrated electronic actuator, which removes that failure point in one move.

Secondary Codes That Usually Clear

Expect P0236 (Turbo Boost Sensor Range) to clear with the primary repair. P0401 and P0402 (EGR Flow Insufficient/Excessive) often clear too — a healthy turbo restores the exhaust backpressure the EGR system needs for correct metering.

After installation, run a DPF forced regeneration and a DTC reset via XENTRY or an equivalent bidirectional scan tool. XENTRY maps these faults to sub-codes — for example, P0299FA for "boost pressure of turbocharger 1 too low."

Field Diagnosis: Two Tests Before You Order

Limp Mode Only During DPF Regeneration

During active regeneration, exhaust gas temperatures spike to 950–1,050°C. Carbon-fouled VNT vanes cannot adjust geometry fast enough to hold commanded boost, so the ECU logs P0299. To verify, watch the Charge Pressure Positioner actual vs. specified values in XENTRY — a deviation over 8% confirms VNT binding.

P0234: Turbo, Actuator, or MAP Sensor?

Apply vacuum directly to the actuator diaphragm. If the rod does not move through its full 12–15 mm range, the actuator is faulty. If the VNT mechanism itself is locked — check by hand with the actuator removed — the entire turbocharger must be replaced. The pre-calibrated electronic actuator on the #9V110 assembly removes the most common root cause out of the box.

Materials: Why This Unit Handles 1,050°C

Turbine Side

The turbine housing is cast from high-silicon-molybdenum (SiMo) ductile iron, which resists thermal fatigue better than gray cast iron. That matters on an engine that sustains exhaust gas temperatures above 900°C during DPF regeneration. The turbine wheel is Inconel 713C, a nickel-based superalloy chosen for creep resistance at 1,050°C.

Compressor Side

The compressor wheel is forged 7075-series aluminum with a hard-anodized coating against particulate erosion. The same philosophy now runs through 2026 OEM turbo programs at Ford (EcoBlue), GM (Duramax 2.8L), and Toyota (GD-series).

The lightweight, high-durability mix tracks the direction set by the Automotive Lightweight Materials 2026 consortium and suppliers such as Carpenter Technology and Hexcel.

Service Life and Maintenance

Under normal operating conditions with proper oil intervals, the projected 2026 service life is 150,000–200,000 km — the same span the OE unit carries. Use oil meeting Mercedes spec 229.51 or 229.52 and hold the change intervals.

The OM651 gave way to the OM654 in 2016, but an estimated 4.2 million OM651 vehicles were still on the road as of Q1 2026. That fleet keeps aftermarket demand steady through at least 2030 — this SKU's projected service window.

While You Are In There: W205 Companion Fixes

A turbo job on a W205 already means a disconnected battery and loose trim panels. If the driver-side window switch has been slow or dead, this is the cheapest moment to fix it. The Master Power Window Control Switch A2059051513 is a direct fit for the W205 C-Class, and the Master Power Window Control Switch 2059057011 covers the same car.

Need anything else for the car or the bike? The Koeep auto and motorcycle parts collection is the one-stop shop for components.

If the refresh extends to the cabin, our guide to the 2017–2019 Mercedes GLS550 OEM interior floor mat set in brown Designo covers premium interior protection.

FAQ: RHF5 #112222P006 / #9V110