Mercedes CLS 350d 258 hp — Stage 1 file (+42 hp)

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Chip tuning for Mercedes CLS 350d 258 hp ECU

Mercedes CLS (2010 - C218) 350d 258 hp — premium diesel engine of the passenger segment of the Mercedes-Benz Group AG (Mercedes-Benz, AMG, Maybach, Smart, EQ) group (Германия, 1926). Stage 1 chip tuning raises power from 258 to 300 hp (+42 hp, +16%) and torque from 620 to 700 Nm (+80 Nm). This engine ships with different ECU variants: Delphi CPC2, Bosch EDC17CP57, Bosch VGS3-NAG3, Siemens/Continental VGS4-NAG2. The flashing method is determined by the specific unit: OBD, Bench or Boot mode. In the CHIPOK database: 4 configurations · 4 ECU variants. The 2010 generation — mid-generation diesels on the EDC17 platform with OBD reading support and no need for Bench.

Mercedes-Benz is the world's oldest carmaker, founded in 1926 by the merger of Daimler-Motoren-Gesellschaft and Benz & Cie. The Mercedes slogan is 'Das Beste oder nichts' ('The best or nothing'). Smart is Mercedes's city sub-brand, historically running Mitsubishi and Renault engines. Mercedes pioneered CDI (Common-rail Direct Injection) technology on passenger-car diesels, in series production since 1997. Mercedes diesels have long been popular with the German police and taxi services. Mercedes diesel engines are fitted to passenger cars and commercial vehicles.

The Mercedes community in Europe has a large pool of available Stage files for the standard models. Stage 1 on Mercedes often requires refreshing the adaptations after the flash. On Mercedes up to the recent generation, Stage 1 OBD flash is available. High-output Mercedes engines are premium-class with solid headroom for Stage 1. On modern high-output Mercedes, Bench reading is often required because of the encryption. The Mercedes premium segment is a high-output platform with Stage 2 potential.

Frequently asked questions

How much horsepower does Stage 1 add for the Mercedes CLS 350d 258 hp?

After Stage 1 the power of the Mercedes CLS 350d 258 hp rises from 258 to 300 hp, a gain of 42 hp (+16%). Torque rises from 620 to 700 Nm (+80 Nm).

How does Stage 1 differ from stock on the Mercedes CLS?

Stage 1 is a software optimization of the factory ECU firmware of the Mercedes CLS with no hardware changes. The injection, boost, ignition-timing and torque maps are reprogrammed. The gain is +42 hp with no hardware changes.

Do you need hardware changes for Stage 1 on the Mercedes CLS?

The high-output Mercedes CLS 350d 258 hp has a conservative factory calibration aimed at the mass market. Stage 1 unlocks the engine's real potential while turbo and injector life are preserved.

What is Stage 2 for the Mercedes CLS 350d 258 hp?

Stage 2 on the Mercedes CLS 350d 258 hp means software + hardware (exhaust, intake, intercooler). The gain depends on the specific hardware combination.

Which control units is the Mercedes CLS 350d 258 hp built with?

The Mercedes CLS 350d 258 hp comes with 4 ECU variants: Delphi CPC2, Bosch EDC17CP57, Bosch VGS3-NAG3, Siemens/Continental VGS4-NAG2. Calibration is done for the specific unit after the revision is identified.

Does the factory warranty of the Mercedes CLS remain valid after Stage 1?

After remapping the Mercedes CLS, the official factory warranty on the engine and gearbox is lost (this applies to any manufacturer when the ECU is modified). CHIPOK guarantees the quality of the calibration and free revisions.

How long is the wait for a Stage 1 remap for the Mercedes CLS?

Reading and writing via OBD takes 25-30 minutes on the Mercedes CLS. Bench reading (BDM/JTAG) takes about 60 minutes plus refitting. Remote file processing at CHIPOK takes 5-30 minutes.

How do you roll back to the factory firmware of the Mercedes CLS?

Before Stage 1 the original of the Mercedes CLS 350d 258 hp is read out and saved — returning to the factory state is possible at any time.

How much does chip tuning the Mercedes CLS 350d 258 hp cost?

The remap price for the Mercedes CLS 350d 258 hp is dynamic and is calculated in the CHIPOK calculator based on the selected options. A credit-based payment model, with no subscription fees.

Last updated: 31.08.2026 · Source: manufacturer technical documentation · Measurements: CHIPOK dyno