1.0 and 1.4 Boosterjet engine: faults and reliability

• 1.0 Boosterjet 110-112 hp (K10C, three-cylinder, 2015-present)

  since 2015 · 110–112 hp · K10C

  Buy

  We have not found any widespread mechanical fault documented for this engine in the German TÜV inspection reports or in the owner testimonies we consulted; the only point to watch, according to several owners, is real-world fuel consumption above the official figure in town driving.^{[2][3][9][10]}

• 1.4 Boosterjet 140 hp (K14C, non-hybrid, 2015-2020 in Europe)

  2015–2020 · 140 hp · K14C

  Buy

  The German TÜV inspection reports for the Vitara and Swift do not single out the engine as a weak point, and we have not found any documented mechanical faults specific to this version; the Swift Sport with this engine also gets good press reviews for its handling.^[2][3][11]

• 1.4 Boosterjet Mild Hybrid 129 hp (K14D, 48V SHVS, since 2020)

  since 2020 · 129 hp · K14D

  Buy

  It is the most recent version and we have not found sources documenting faults specific to the 48 V mild-hybrid system on this engine; as there is not yet much mileage in the used-car market, it is still worth checking the service history, as with any mild hybrid.^[7][8]

Buy: No known serious faults, or they have already been corrected, in this version. With caution: Worth buying if something specific is verified: history, a replaced part or a completed campaign. Avoid: High risk of a serious fault that is hard to check for or prevent.

1. 1Low severityFrequency: RareTimingTiming chain: no documented pattern of failuresThe 1.0 and 1.4 Boosterjet use a timing chain, not a belt. We have not found a single documented case of chain stretch or breakage on these engines in the technical press, the German TÜV inspection reports or the owner testimonies we consulted.
2. 2Low severityFrequency: RareLubricationOil consumption: no documented patternNeither the German TÜV inspection reports nor most owner testimonies describe high oil consumption on the 1.0 or the 1.4 Boosterjet; we have only found one isolated case, with no further detail, on a review forum.
3. 3Low severityFrequency: RareInjectionDirect injection and fuel pump: no documented faults or recallsWe have not found any recall or pattern of failures of the high-pressure pump or injectors on the 1.0 or the 1.4 Boosterjet, unlike other small direct-injection turbo engines from other manufacturers.
4. 4Low severityFrequency: RareElectronics48 V SHVS mild-hybrid system: no documented faults so farThe 48 V mild-hybrid system on the 1.4 Boosterjet (K14D) has been on the European market since 2020; we have not found sources documenting faults with its lithium battery or its starter generator in the time it has been on the road.

Severity colours: low, medium, high, critical. How we rate them

Manufacturer

Suzuki Motor Corporation

Family

Familia de motores K (Suzuki)

Fuel

Petrol

Displacement

—

Cylinders

—

Fuel system

Turbo

Injection

Direct injection

Timing

Chain

Power

110–140 hp

Peak torque

235 Nm

Production

since 2015

Makes

Suzuki

Technical data^[1][6][7][8]

1. since 2015

   1.0 Boosterjet 110-112 hp (K10C, three-cylinder, 2015-present)

   The entry-level version of the Boosterjet family: a 998 cc three-cylinder with turbo and direct injection, designed as an alternative to diesel in small and medium-sized cars; in Spain it arrived first in the Baleno and the S-Cross (2016), then in the Swift (2017) and the Vitara (2018).^[1][12][14]

2. 2015–2020

   1.4 Boosterjet 140 hp (K14C, non-hybrid, 2015-2020 in Europe)

   The most powerful version of the family, with 140 hp and between 220 and 230 Nm depending on the model; it was the engine of the Vitara S and the S-Cross, and from 2018 also of the Swift Sport. Suzuki stopped offering it in Europe in mid-2020, replacing it with the K14D mild-hybrid variant.^{[1][12][13][15]}

3. since 2020

   1.4 Boosterjet Mild Hybrid 129 hp (K14D, 48V SHVS, since 2020)

   Adds the 48 V SHVS mild-hybrid system (lithium battery and belt-driven ISG), which raises the compression ratio to 10.9:1 and torque to 235 Nm, although power drops from 140 to 129 hp. It replaced the K14C in the Vitara, S-Cross and Swift Sport in Europe from 2020.^[7][8]