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Engine Oil Cooler 264102F020: 2026 Technical Consensus & DTC Mapping for Hyundai/Kia D4HA/D4HB Platforms
Engine Oil Cooler 264102F020: What You Need to Know Before 2026 Service
If your Hyundai or Kia diesel runs the D4HA 2.0L or D4HB 2.2L CRDi engine, the Engine Oil Cooler 264102F020 is the part holding your oil temperature in check. It is a water-cooled, aluminum-alloy thermal management unit, OEM cross-reference 26410-2F020, mounted in the engine's coolant-oil interface circuit.
The hardware is compact: a multi-rib aluminum core weighing roughly 774 g net, with core dimensions near 118 mm × 193 mm × 117 mm. Small package, heavy workload — this unit manages oil temperature on every drive cycle.
Timing matters too. The global automotive thermal management market is projected at USD 109.02 Bn in 2026 (6.2% CAGR through 2033), and OEMs are leaning on high-efficiency aluminum coolers to meet Euro 7 and CARB 2026 emissions mandates. This unit complies with SAE J1342 heat exchanger performance benchmarks and aligns with ISO 26262 ASIL-B functional safety requirements for 2026-model-year thermal subsystems.
Fitment: Which Vehicles Take This Cooler
One part number covers a wide slice of the Hyundai-Kia diesel range:
- Hyundai Santa Fe (DM/TM, 2013–2022) and Grand Santa Fe
- Hyundai Tucson (TL, 2015–2022)
- Hyundai Elantra (AD, 2016–2020)
- Kia Sorento (UM, 2014–2020)
- Kia Carnival/Sedona and Kia Sportage (QL, 2016–2021)
Engine coverage spans the D4HA 2.0L CRDi, D4HB 2.2L CRDi, and D4EA — the Hyundai-Kia R-engine family. One trap to avoid: 2026 Carnival models with the Smartstream G3.5 GDi (Lambda III) gasoline engine run cooler 26410-3LAA0, which is not cross-compatible.
Technical Specification Matrix
Every value below comes straight from the OEM data set for this part, mapped against the 2026 industry benchmarks.
| Specification | 264102F020 Value | Industry Standard / 2026 Benchmark |
|---|---|---|
| Part Number | 264102F020 / 26410-2F020 | Hyundai-Kia Genuine / MOBIS OEM |
| Material | A380/A383 Aluminum Alloy (MLB Brazed) | ASTM B85 / SAE J452 / ISO 3522 |
| Cooling Type | Water-Cooled (Plate-and-Fin) | SAE J1342 Class II |
| Core Dimensions (L×W×D) | ~118 mm × 193 mm × 117 mm | OEM D4HA/D4HB spec |
| Net Weight | ~774 g | Lightweight class (sub-800 g) |
| Operating Mode | Electronically Controlled (PWM Bypass) | CAN-bus 3.0 / ISO 11898-1:2024 |
| Continuous Temp Rating | -40°C to +150°C | SAE J1211 / ISO 16750-4 |
| Primary DTC Range | P0196–P0198, P0520–P0523 | SAE J2012 / ISO 15031-6:2024 |
| Projected Service Life | 2026–2030 (8–10 year / 120,000 mi) | OEM lifecycle benchmark |
| Compatible Engine Codes | D4HA (2.0L CRDi), D4HB (2.2L CRDi), D4EA | Hyundai-Kia R-Engine family |
Materials and Build: Why the MLB Core Lasts
The 2026 aftermarket has shifted toward high-temp composite-aluminum hybrid constructions that resist galvanic corrosion at the coolant-oil interface. The 264102F020 answers with a gasket-sealed plate-and-fin architecture built on multi-layered aluminum brazing (MLB) technology.
That directly addresses the solder-joint fatigue failures common in first-generation Hyundai/Kia oil coolers from 2010–2014. The MLB fin construction meets SAE J1342 Class II durability requirements — rated for 10,000+ thermal cycles between -40°C and +150°C without joint fatigue.
The metallurgy checks out as well: the A380/A383 casting conforms to ASTM B85, SAE J452, and ISO 3522, with continuous service up to 150°C. For 2026, Hyundai Motor Group material specification MS 591-09 caps galvanic corrosion depth at 0.05 mm after 1,000-hour salt-spray testing (ISO 9227).
Critical diagnostic note: on 2026 vehicles equipped with CAN-bus 3.0 FD gateways, a failing oil cooler may not immediately light the MIL. Freeze-frame data captured at 500 ms intervals can show a gradual oil temperature delta drift beyond ±8°C from the modeled baseline — a condition visible only through a J2534 pass-through scan tool running Hyundai GDS/KDS 2026 software.
DTC Mapping: Codes That Point to This Cooler
The 264102F020 sits directly in the ECM's oil temperature and pressure monitoring circuits, so failure codes arrive in a predictable order.
Primary Codes
- P0196–P0198 — Engine Oil Temperature (EOT) sensor Range / Performance / Circuit Low / Circuit High
- P0520–P0523 — Engine Oil Pressure Sensor Circuit / Performance
Cascade Codes on Diesel Variants
On D4HA/D4HB engines the cooler doubles as an EGR pre-cooler. When its efficiency drops, secondary codes follow in the P0400-series — P0401–P0404 (EGR Flow Insufficient/Excessive). Left unchecked, oil-coolant intermix can cascade into EGR cooler clogging and DPF regeneration faults, logging P2002 and P2459.
Hyundai Motor Group's updated 2026 technical service bulletins are blunt about it: verify oil cooler integrity whenever P0196, P0197, or P0198 are logged, particularly on D4HA/D4HB engines.
What Changed With 2026 Diagnostics
Two updates matter. Under SAE J2012-DA (2024 revision), 2026 OBD-II implementations store pending codes after 2× drive-cycle confirmation instead of the legacy 3× — MIL illumination for oil-cooler faults arrives sooner.
The cooler's electronic control module also integrates with the 2026 CAN 2.0B/3.0 FD gateway architecture, streaming real-time oil temperature to the ECM via SAE J1979 (OBD-II) and UDS (ISO 14229-1). Its PWM coolant bypass supports cold-start thermal management, a feature mandated under Euro 7 cold-start emissions protocols effective January 2026.
Service Intervals Worth Following
Hyundai and Kia call for oil cooler inspection at every 60,000-mile major service interval. On D4HB 2.2T applications running severe-duty cycles, proactive replacement between 90,000–120,000 miles is advised.
Projected service life is 8–10 years or roughly 120,000 miles, in line with the 2026 Hyundai-Kia powertrain warranty cycle for diesel applications. With D4HA/D4HB phase-outs approaching the 2030 Euro 7 sunset in select markets, this cooler stays a critical service part through the 2026–2030 window.
Ordering, Support, and Related Guides
The Engine Oil Cooler 264102F020 for Santa Fe, Grand Santa Fe, Sorento, Carnival, and Sedona ships with full OEM-cross-referenced traceability on the SKU. Planning a bigger job? The auto and motorcycle parts catalog pulls the rest of your components into one order.
Unsure about fitment on your exact build? Send your VIN and engine code through the request-for-quote page, email support@koeep.com, or message the team on WhatsApp.
Not every job lives under the hood. If the cabin needs attention too, this carbon fiber console molding sticker guide for the Sonata 9th generation applies the same match-the-part-number logic to interior trim.
Get the 264102F020 Ordered
Match the part number, verify your engine code, and restore proper oil temperature control on your D4HA or D4HB diesel.
View the Engine Oil Cooler 264102F020Frequently Asked Questions
Why does my 2026 Santa Fe 2.2 CRDi log P0198 right after a cold start?
On 2026 D4HB engines with CAN-bus 3.0, the ECM runs a zero-offset calibration check of the EOT sensor within 3 seconds of key-on. Internal coolant seepage — even micro-leakage below 0.5 mL/hr — drifts the sensor reference voltage high and sets P0198 before the engine warms up. This sensitivity ships with Hyundai ECU firmware version 6.2.x. Replace the cooler, then run a KDS coolant-pressure decay test to verify resolution.
Is the 264102F020 correct for a Kia Carnival or Sedona 2.2T diesel?
Yes. The Kia Carnival (KA4, 2022–present) and Sedona (YP, 2014–2020) with the D4HB 2.2L CRDi use the identical 264102F020 assembly, cross-referenced in Kia's GDS software under MOBIS group code 26410 (Cooler Assy-Eng Oil). The exception is gasoline: 2026 Carnival models with the Smartstream G3.5 GDi (Lambda III) use part 26410-3LAA0 and are not cross-compatible.
What are the early-warning symptoms on a Grand Santa Fe?
On the Grand Santa Fe (NC, 2013–2019) with the D4HB, four signs appear before any code: milky oil-in-coolant emulsion in the reservoir; 0.5–1.0 L of coolant loss per 1,000 km with no external leak; oil temperature at or above 125°C in moderate highway cruising; and a hot-oil odor near the oil filter housing after shutdown. A pending P0196 stores when the ECM's oil temperature model drifts more than 12°C from the EOT sensor.
Can I retrofit the 264102F020 onto an older Santa Fe CM (2006–2012)?
No. This cooler was designed for the R-engine family (D4HA/D4HB) from the Santa Fe DM (2013) onward. The CM generation ran the D4EB 2.2L engine with part 26410-2F000, which has different bolt patterns, gasket profiles, and coolant port geometry. A retrofit ends in mounting-surface mismatch and possible oil-coolant cross-contamination.
When should I replace the cooler preventively?
Inspection belongs at every 60,000-mile major service. On D4HB 2.2T applications in severe-duty cycles, proactive replacement between 90,000–120,000 miles is advised — well inside the unit's projected 8–10 year, 120,000-mile service life.
Why did the check engine light stay off if the cooler is failing?
On 2026 CAN-bus 3.0 FD gateways, the fault can sit below the MIL threshold. The giveaway is freeze-frame data at 500 ms intervals showing oil temperature delta drift beyond ±8°C from the modeled baseline. Only a J2534 pass-through scan tool with Hyundai GDS/KDS 2026 software surfaces it reliably.
- Engine Oil Cooler 264102F020 for SANTA FE / GRAND SANTA FE / SORENTO / CARNIVAL / SEDONA — koeep.com
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- SAE J1342 heat exchanger performance benchmark and Class II durability rating cited for the 264102F020 cooling type
- ASTM B85, SAE J452, and ISO 3522 — casting material and chemical composition standards for the A380/A383 aluminum alloy
- Hyundai Motor Group 2026 technical service bulletins and material specification MS 591-09 — oil cooler verification triggers and galvanic corrosion limits