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4PCS Fuel Injectors For Mercedes-Benz C230 1.8L 2003-2005 – Complete Guide (2710780549)
4PCS Fuel Injectors for Mercedes-Benz C230 1.8L (2003–2005): M271 Kompressor Replacement Guide
2026 Mercedes Fuel System Field Reference · KOEEP
Is Your M271 Engine Showing Misfire or Rough Idle?
The Mercedes-Benz C230 (W203 chassis) equipped with the 1.8L supercharged M271 engine is a beloved vehicle among luxury compact sedan enthusiasts. However, after years of service, the fuel injectors — the precision components responsible for delivering metered fuel into each combustion chamber — can degrade, leading to rough idling, misfires, poor fuel economy, and failed emissions tests.
If you are experiencing any of these issues, replacing all four fuel injectors at once is the most effective solution. The KOEEP 4PCS Fuel Injectors for Mercedes-Benz C230 1.8L 2003–2005 (OE# 2710780549) offer a direct OEM-quality replacement that restores engine performance and driving confidence.
"The M271 Kompressor is sensitive to fuel delivery. Carbon buildup on the injector tips can cause rough idle and P0300-series misfire codes long before the O2 sensor sees a problem. Replacing all four injectors as a matched set is the only fix that actually clears the codes permanently."
What Is in the 4PCS Injector Kit?
The KOEEP 4PCS Fuel Injector Set (PN: 2710780549 / 2710780023) is a complete replacement kit of four injectors designed specifically for the M271 1.8L Kompressor engine. Each injector is manufactured to meet or exceed OEM specifications, ensuring a seamless fit and reliable performance.
| Component | Qty | Function |
|---|---|---|
| High-Pressure Fuel Injectors | 4 | Replace all four factory injectors as a matched set |
| Pre-Installed O-Rings | 8 (2 per injector) | Seal against fuel rail and intake manifold; leak-free install |
| 2-Pin Electrical Connectors | 4 | Match the factory wiring harness plug; no adapter needed |
| Injector Identification Sticker | 1 | Records part numbers and flow-rate codes for service records |
Vehicle & Cross-Reference Compatibility
Vehicle Fitment
| Make | Mercedes-Benz |
| Model | C230 (W203 Chassis) |
| Engine | 1.8L M271 Supercharged (Kompressor) |
| Years | 2003, 2004, 2005 |
OEM Cross-Reference Numbers
| 2710780549 | (superseded / revised PN; current OE) |
| A2710780549 | (Mercedes-Benz A-class PN, identical fit) |
| 2710780023 | (earlier OE PN; superseded by 2710780549) |
| FJ902 | (aftermarket cross-reference code) |
The Numbers Behind the Recommendation
Why a matched set of four, and why KOEEP? Here is the side-by-side comparison most W203 owners find useful.
Symptoms That Tell You It Is Time
Experienced W203 owners and Mercedes specialists consistently point to six warning signs when the M271 injectors are reaching end-of-life. If two or more of these match your symptoms, the right move is a complete four-injector replacement, not a single-injector swap.
- Rough idle: the engine shakes or vibrates excessively when stopped at traffic lights or in park.
- Engine misfires: check engine light illuminates with codes P0300–P0304 (random or multiple cylinder misfires).
- Poor fuel economy: a 15–30% drop in miles per gallon is a strong indicator of unbalanced fuel delivery.
- Hard starting: the engine cranks longer than usual before firing up, especially on cold starts.
- Failed emissions test: high hydrocarbon (HC) readings due to incomplete combustion.
- Fuel smell: raw fuel odor from the exhaust or engine bay, often combined with a slightly black-tipped spark plug.
Technical Specifications
| Specification | KOEEP Injector | OE Standard |
|---|---|---|
| Part Numbers | 2710780549 / 2710780023 | 2710780549 / A2710780549 |
| Quantity per Set | 4 Injectors | 4 Injectors |
| Terminal Quantity | 2-Pin | 2-Pin |
| O-Rings Included | Yes (pre-installed) | Yes |
| Application | Mercedes C230 1.8L 2003–2005 | Mercedes C230 1.8L 2003–2005 |
| Engine Type | M271 Kompressor | M271 Kompressor |
| Quality Standard | OEM Equivalent | OEM |
Installation Overview: What You Need to Know
Replacing the M271 fuel injectors is a 90-minute to 2-hour job for the experienced DIY mechanic, or a routine service for any Mercedes specialist. Here is the workflow.
- Relieve fuel system pressure: remove the fuel pump fuse and crank the engine for 5 seconds to depressurize the rail. This step is non-negotiable for safety.
- Remove the engine cover and intake plenum: the M271 Kompressor intake sits directly above the fuel rail. Disconnect the MAF sensor and idle air controller before lifting the plenum.
- Disconnect the fuel rail: release the quick-connect fitting at the supply line, then unbolt the rail mounting bolts (10 mm socket, 8 ft-lbs). The rail will lift off with the injectors still attached.
- Transfer the old injectors out / new injectors in: pull each old injector from the rail with a gentle twist. Lightly oil the new O-rings with clean engine oil, then press each new injector into the rail until it clicks.
- Reinstall and verify: lower the rail back onto the intake ports, torque the rail bolts in sequence, reconnect the fuel line and electrical connectors, then reinstall the intake plenum.
- Clear codes and test: start the engine and let it idle for 5 minutes. Clear the P0300-series codes with an OBD-II scanner, then take a 20-mile mixed driving cycle to confirm the codes do not return.
Technical FAQ
Yes. These injectors are specifically designed for the 2003, 2004, and 2005 Mercedes-Benz C230 equipped with the 1.8L M271 Kompressor engine. They are a direct bolt-on replacement with OE part numbers 2710780549, A2710780549, and 2710780023.
Highly recommended. Replacing all four injectors at the same time ensures balanced fuel delivery across all cylinders, prevents future drivability issues, and saves the labor cost of replacing them one at a time. The KOEEP 4PCS set gives you exactly what you need.
Yes. Each injector comes with O-rings pre-installed. This means you do not need to purchase additional sealing components separately. However, it is always good practice to lubricate the O-rings lightly with clean engine oil before installation to prevent tearing.
Basic hand tools including a 10 mm socket, Torx T25 and T30 bits, fuel rail removal tools (if needed), and a set of picks for removing electrical connectors. Always relieve fuel system pressure before disconnecting any fuel lines. We recommend consulting a Mercedes-Benz service manual or a professional mechanic if you are not experienced with fuel-system work.
If the check engine light is caused by misfire codes (P0300–P0304) or fuel trim codes (P0171, P0172), replacing faulty injectors is very likely to resolve the issue. After installation, clear the codes with an OBD-II scanner and take the vehicle for a test drive to confirm the light stays off.
Both part numbers are used interchangeably for the Mercedes C230 1.8L M271 engine. The 2710780549 is a superseded or revised version of the earlier 2710780023, offering the same fit, form, and function. The KOEEP injector set is compatible with both OEM numbers.
These injectors are primarily designed for the C230 1.8L (2003–2005). Some other Mercedes models with the M271 engine may also be compatible, but we recommend verifying your vehicle's engine code and OEM part number before purchasing. Check the product page for full compatibility details.
Ready to Restore Your C230's M271 Performance?
If your 2003–2005 Mercedes-Benz C230 is showing rough idle, misfire codes, or poor fuel economy, send your VIN to our team for fitment verification, or request a quote on the complete 4-piece injector set. Premium quality, 1-year warranty, free worldwide shipping.
Or email support@koeep.com directly. 24/7 response on weekdays. Browse the full KOEEP Engine Parts collection for related SKUs.
Disclaimer: This article is for informational purposes only. Fuel-injector replacement involves pressurized fuel and should be performed by a qualified mechanic. Always relieve fuel system pressure before disconnecting any fuel lines. Improper installation can result in fuel leaks, engine damage, or fire. Professional installation is recommended.