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4PCS Fuel Injectors For Mercedes-Benz C230 1.8L 2003-2005 – Complete Guide (2710780549)
Rough Idle and Misfire Codes on Your M271? Start With the Injectors
The Mercedes-Benz C230 (W203 chassis) with the 1.8L supercharged M271 Kompressor engine is a favorite among luxury compact sedan owners. But after years of service, its fuel injectors — the precision parts that meter fuel into each combustion chamber — degrade. The result: rough idling, misfires, poor fuel economy, and failed emissions tests.
If your engine shows any of these problems, replacing all four injectors at once is the fix that works. The KOEEP 4PCS Fuel Injectors for Mercedes-Benz C230 1.8L 2003–2005 (OE# 2710780549) is a direct OEM-quality replacement set built for exactly this job.
- 4 injectors per kit — one matched set, complete
- OE-spec fit for part numbers 2710780549 / 2710780023
- 2-pin connectors that match the factory harness
- O-rings pre-installed — no extra sealing parts to buy
What a Mercedes specialist sees in the field
"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 Comes in the 4PCS Injector Kit?
The KOEEP 4PCS Fuel Injector Set (PN: 2710780549 / 2710780023) is a complete four-injector kit designed specifically for the M271 1.8L Kompressor engine. Each injector is manufactured to meet or exceed OEM specifications, so it fits and performs like the factory part.
- 4 high-pressure fuel injectors — replace all four factory injectors as a matched set.
- 8 pre-installed O-rings (2 per injector) — seal against the fuel rail and intake manifold for a leak-free install.
- 4 two-pin electrical connectors — match the factory wiring harness plug. No adapter needed.
- 1 injector identification sticker — records part numbers and flow-rate codes for your service records.
Vehicle Fitment and Cross-Reference Numbers
Will it fit your car?
| Vehicle Detail | Specification |
|---|---|
| Make | Mercedes-Benz |
| Model | C230 (W203 chassis) |
| Engine | 1.8L M271 Supercharged (Kompressor) |
| Model years | 2003, 2004, 2005 |
OEM cross-reference numbers
| Part Number | Notes |
|---|---|
| 2710780549 | Superseded / revised PN; current OE |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 |
If you want to compare this injector set against other fuel-system components before you buy, browse the Air & Fuel Delivery Parts collection for the full catalog of matching SKUs.
Six Symptoms That Say It Is Time
Experienced W203 owners and Mercedes specialists consistently point to six warning signs when M271 injectors reach end-of-life. If two or more match what you feel behind the wheel, 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 on 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 caused by incomplete combustion.
- Fuel smell. Raw fuel odor from the exhaust or engine bay, often combined with slightly black-tipped spark plugs.
Why waiting costs money: driving with bad fuel injectors can lead to catalytic converter damage, oxygen sensor failure, and even engine cylinder-wall scoring from incomplete combustion. Replacing all four injectors as a matched set keeps fuel delivery balanced and protects the engine long term.
Technical Specifications: KOEEP vs OE Standard
| 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: 90 Minutes to 2 Hours
For an experienced DIY mechanic, replacing the M271 injectors is a 90-minute to 2-hour job. Any Mercedes specialist handles it as routine service. 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 lifts off with the injectors still attached.
- Swap the injectors. 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 refit 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 run a 20-mile mixed driving cycle to confirm the codes do not return.
Tools you need
- 10 mm socket, plus Torx T25 and T30 bits
- Fuel rail removal tools, if needed
- A set of picks for removing electrical connectors
- OBD-II scanner to clear codes after the swap
Replace all four, even if only one cylinder misfires. The M271 fuel trim adapts to the average flow rate across all four cylinders. A single old injector forces the ECU to compensate in a way that can damage the new injectors prematurely.
One more thing before you button everything up: what flows through your new injectors matters too. Our OEM filter vs aftermarket fuel filter comparison walks through the trade-offs so you can decide what to run upstream of the rail.
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.
Technical FAQ
Will these fuel injectors fit my 2004 Mercedes-Benz C230?
Yes. These injectors are designed specifically for the 2003, 2004, and 2005 Mercedes-Benz C230 equipped with the 1.8L M271 Kompressor engine. They are a direct bolt-on replacement for OE part numbers 2710780549, A2710780549, and 2710780023.
Do I need to replace all four injectors at once?
Highly recommended. Replacing all four at the same time ensures balanced fuel delivery across all cylinders, prevents future drivability issues, and saves the labor cost of doing the job twice. The KOEEP 4PCS set gives you all four in one kit.
Does the set come with O-rings?
Yes. Each injector comes with O-rings pre-installed, so you do not need to purchase sealing components separately. It is still good practice to lubricate the O-rings lightly with clean engine oil before installation to prevent tearing.
What tools are needed to replace the fuel injectors?
Basic hand tools: a 10 mm socket, Torx T25 and T30 bits, fuel rail removal tools if needed, and a set of picks for the electrical connectors. Always relieve fuel system pressure before disconnecting any fuel lines. If you are not experienced with fuel-system work, consult a Mercedes-Benz service manual or a professional mechanic.
Will replacing the fuel injectors fix my check engine light?
If the 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.
What is the difference between 2710780549 and 2710780023?
Both part numbers are used interchangeably for the 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.
Can these injectors be used on other Mercedes models?
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 verify your vehicle's engine code and OEM part number before purchasing. Check the product page for full compatibility details.
- KOEEP — 4PCS Fuel Injectors for Mercedes-Benz C230 1.8L 2003–2005 (2710780549) product page
- KOEEP — Air & Fuel Delivery Parts collection
- KOEEP Blog — OEM Filter vs Aftermarket: The Ultimate Fuel Filter Comparison
- KOEEP — Request for Quote (VIN fitment verification)
- KOEEP — WhatsApp support line
- KOEEP — support@koeep.com (24/7 response on weekdays)