Turbo 1.7 CRDi

1.7 CRDi: a single engine code D4FD, but why have turbo references varied across power outputs and models?

The 1.7 CRDi from the Hyundai-Kia group is built around a single engine code, the D4FD, found across the Kia Sportage and Kia Carens as well as the Hyundai Tucson, Hyundai ix35 and Hyundai i40. That said, this engine was produced in several power outputs: 116 hp in its most common form, then 136 hp and 141 hp on certain variants. A shared engine code does not mean a single turbo reference: the power output and the vehicle model can point to distinct manufacturer references, as illustrated by references such as 794097-5003S or 824168-5002S found in this collection.

The D4FD trap: identifying the right turbo despite a shared engine code

When the same engine powers vehicles of different sizes and uses — a compact SUV such as the Tucson, a crossover such as the ix35, a family saloon such as the i40 — the thermal and mechanical requirements are not identical. The manufacturer reference stamped on the original turbo therefore remains the only reliable guide to confirming compatibility. Equivalent references (in RM or M… format) appear alongside original references in the product listings: they denote the same part but come from different sources. Before placing any order, it is essential to check the reference on the turbo that has been removed rather than relying solely on the stated power output.

Failure causes and symptoms on the D4FD

On this diesel engine, turbo failures most commonly present as blue or black exhaust smoke, an unusual whistling noise under acceleration, or a marked loss of power. Insufficient lubrication — often caused by extended oil-change intervals or degraded oil — remains the leading cause of bearing wear. A clogged air intake circuit or particulate filter can also create excess back-pressure that damages the turbo. Before fitting a new turbo, it is essential to address the root cause: clean the oil galleries, check the intake circuit for leaks, and ensure there are no foreign bodies present. All turbos listed here are brand-new turbos, sold with no old unit to return.