MinorAffected: 2013-202160,000–120,000 miles

Nissan Qashqai J11 1.5 dCi 110bhp — Engine Thermostat Sticking Open

The engine coolant thermostat fails in the 'open' position. The engine never reaches its optimal operating temperature, killing fuel economy.

Severity

Minor

DIY Difficulty

Moderate

Est. Cost

£100–£250

OBD Codes

P0128

Component Diagram

Cooling

Typical layout and location for the Cooling assembly.

Reference Illustration

Symptoms

Temperature gauge drops when driving on the motorway
Heater blows lukewarm air in winter
MPG drops significantly
Engine takes a very long time to warm up

Root Cause

The wax element inside the thermostat degrades, or the return spring weakens, preventing the valve from closing off coolant flow to the radiator.

How To Fix

Scan for P0128 (Coolant Thermostat - Coolant Temp Below Regulating Temp).
Replace the thermostat housing unit and gasket.
Bleed the cooling system of air.
Cost: £100-250

Estimated Repair Costs

Repair Option	Est. Cost (GBP)
DIY (parts only)	£40–£100
Independent Garage	£100–£250
Main Dealership	£160–£400

Other Faults on This Variant

Electronic Parking Brake (EPB) Motor Failure

Severe

2014-202150,000–100,000 miles£200–£300

The electronic parking brake actuators on the rear brake calipers frequently seize or burn out, leaving the handbrake stuck on or refusing to engage.

DPF Pressure Sensor Pipe Split

Moderate

2014-202160,000–100,000 miles£5–£100

A tiny rubber hose connecting the DPF to the exhaust pressure sensor splits frequently, causing limp mode and preventing DPF regeneration.

Front Radar / Anti-Collision Sensor Failure

Minor

2014-202140,000–90,000 miles£600–£800

The front radar sensor (used for emergency braking) is poorly sealed and highly vulnerable to water ingress and stone chips, causing the entire safety system to shut down.

Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.