What reliability score does the Kia Optima get?

4.7 out of 10, scored from the 8 faults we document for this model and how severe each one is.

Is the 2016–2020 Kia Optima reliable?

Scored from 8 documented faults · reviewed by the VehicleFaults Research Team

Quick answer

4.7/ 10

Buy with caution

On our documented-fault scoring the Kia Optima rates 4.7 out of 10 · buy with caution. We hold 8 known faults for it and 1 of them are rated critical and 1 high, so a bad example can be expensive. The weak points cluster around engine, electrical and transmission. A well-serviced example with evidence for the big-ticket items is usually a safe buy; the score describes the model, not the specific car in front of you.

Verdict · Walk unless the history is spotless

What the score is built from

Critical: 1
High: 1
Medium: 3
Low: 3

Weak points cluster around engine, electrical, transmission, steering.

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The faults that decide it

EngineCritical

Theta II 2.0T/2.4L engine failure (bearing/knock) — recalls and warranty extensions apply.

Typically appears: 60,000+ miles
What to inspect: Listen for knock; confirm the knock-sensor recall and any engine replacement.
Typical repair: Electrical diagnosis & module repair · £120–£900

EngineHigh

Excessive oil consumption.

Typically appears: 70,000+ miles
What to inspect: Check oil level and history.
Typical repair: Oil leak trace & seal / gasket · £180–£700

SteeringMedium

Clunking or clicking noise from the steering column due to a worn EPS flexible coupling.

Typically appears: 50,000-70,000 miles
What to inspect: With the engine running and the vehicle stationary, rapidly rock the steering wheel left and right. Listen for a distinct plastic or metallic clunk from behind the dashboard.
Typical repair: Steering rack / column repair · £400–£1,500

BrakesMedium

Electronic Parking Brake (EPB) failing to release fully, leading to binding rear brake calipers.

Typically appears: 40,000-80,000 miles
What to inspect: Engage and disengage the EPB switch multiple times. Listen for groaning from the rear wheels and ensure the car rolls freely in neutral without rear-end drag.
Typical repair: Brakes (discs, pads, caliper) · £200–£800

EngineMedium

Hesitation or stuttering under light acceleration caused by soot build-up in the EGR valve on 1.7 CRDi models.

Typically appears: 60,000-100,000 miles
What to inspect: Hold the engine revs steadily at 1,500-2,000 rpm whilst stationary. Feel for misfires or rough running, and check the instrument cluster for an illuminated EML.
Typical repair: EGR valve / cooler replacement · £300–£900

Costs are indicative UK independent-garage bands for budgeting and negotiation · never a quote.

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What the score is built from

The faults that decide it

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