CRDi are diesel engines installed on Hyundai and KIA cars, where a Common Rail injector system is used for fuel supply. They are equipped with MHI or Garrett turbochargers. Variable-geometry turbines, made by BorgWarner, are installed on some versions. These engines have a belt or chain mechanism drive. Usually the fuel supply system is made by Delphi or Bosch. Depending on the version, the fuel injectors can be electromagnetic or piezoelectric.
Popular CRDi engines
| Engine index | Quantity and position of cylinders | Quantity of valves | Capacity, l | Output, hp | Torque, Nm | Production Year start | Applicable models |
| D4CB | 4, in-line | 16 | 2.5 | 116‒177 | 314‒441 | 2001 | Hyundai H-1 A1; Hyundai H-1 TQ; Kia Sorento BL. |
| D3EA | 3, in-line | 12 | 1.5 | 80‒105 | 182‒235 | 2001 | Hyundai Accent LC; Hyundai Matrix FC; Hyundai Getz TB. |
| D4EA | 4, in-line | 16 | 2.0 | 112‒151 | 245‒350 | 2000 | Hyundai Sonata NF; Hyundai Tucson JM; Kia Sportage JE; Hyundai Santa Fe SM; Kia Carens UN; Hyundai Trajet; Kia Magentis MG; Hyundai Santa Fe CM; Kia Cerato LD; Hyundai Elantra XD. |
| D4EB | 4, in-line | 16 | 2.2 | 139‒155 | 343‒353 | 2002 | Hyundai Grandeur TG; Hyundai Sonata EF; Hyundai Santa Fe SM; Hyundai Sonata NF; Hyundai Santa Fe CM. |
| D4HA | 4, in-line | 16 | 2.0 | 136‒185 | 320‒400 | 2009 | Kia Sportage 4; Hyundai Tucson; Hyundai ix35 3; Kia Sportage 3; Hyundai ix35 2. |
| D6EA | V6 | 24 | 3.0 | 239‒250 | 450‒540 | 2006 | Hyundai ix55; Kia Mohave. |
| D3FA | 3, in-line | 12 | 1.1 | 75 | 153 | 2005 | Kia Picanto; Hyundai i10 1; Hyundai i10 2; Hyundai i20 1; Kia Rio 3; Hyundai i20 2. |
| D4FC | 4, in-line | 16 | 1.4 | 75‒90 | 220 | 2008 | Hyundai i20 1; Kia Ceed 2; Hyundai i20 2; Kia Rio 4; Hyundai i30 1; Hyundai Accent RB; Hyundai Creta 1; Kia Rio 3; Hyundai ix20 1; Kia Venga 1. |
| D4FB | 4, in-line | 16 | 1.6 | 90‒136 | 235‒280 | 2005 | Hyundai Elantra 4; Kia Soul 1; Hyundai Accent RB; Kia Cerato 1; Hyundai i30 1; Hyundai i30 2; Kia Stonic 1; Hyundai i30 3; Hyundai ix20 1; Kia Ceed 1; Kia Venga 1. |
| D4FD | 4, in-line | 16 | 1.7 | 114‒141 | 260‒340 | 2010 | Kia Optima 3; Hyundai ix35 2; Hyundai i40 1; Kia Sportage 4; Kia Sportage 3; Hyundai Tucson 3; Kia Carens 3. |
Common malfunctions on CRDi engines
| Malfunctions | Engines |
| Washers under injectors burn out which leads to formation of sludge on the engine. | D4CB, D3EA, D4EA, D4EB. |
| Oil pump pickup tube gets clogged prematurely, which is fraught with bearings misalignment. | D4CB, D3EA, D4EA, D4EB. |
| Injectors and a high-pressure fuel pump have short lifespan. | D3EA, D6EA. |
| A cylinder head can crack in high-mileage vehicles. | D4EA, D4EB. |
| Due to malfunction of the EGR valve and ECU errors the engine stucks at certain rpms. | D4EA, D4EB. |
| The fuel injectors are apt to soiling, which leads to engine misfiring. | D4HA, D3FA, D4FB. |
| Oil consumption increases during dynamic driving. | D4HA. |
| Ingress of exhaust gases into the cooling system causes engine overheating. | D6EA, D4FD. |
| Frequent driving with almost empty fuel tank results in the airlocks in the fuel system. | D6EA. |
| In the course of time oil starts leaking from under the valve cover. | D3FA, D4FC, D4FD. |
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