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Thermostat Replacement cost

Thermostat Replacement on a BMW with the N20/N52/N55 engine typically costs $450 at an independent shop or $3,200 at a BMW dealer, based on 2 real owner-reported prices.

Last updated October 16, 2026 · Sources: 2 owner-reported prices from 2 cited threads

Stuck-open or failed thermostat (standalone, without the water pump). Real prices reported by owners on Reddit and BMW forums, with a link to every one.

N20N52N55F32 F30 E90

Limited data: Two real quotes found for a standalone thermostat.

Typical cost

BMW dealer

$3,200

Median $3,200 · 1 data point

Independent shop

$450

Median $450 · 1 data point

DIY (parts/tools)

No real price found yet

Ranges are the lowest and highest prices in the table below. They are not estimates. Shop prices include parts and labor unless noted.

Every price we found

Price	Where	Details	Source
$450	Indy	Paid, 2015 428i, Los Angeles (shop type not stated)	[1]
$3,200	Dealer	Dealer quote for the thermostat (owners called it inflated)	[2]

If the water pump is original and high-mileage, doing both at once saves labor.

Which cars are affected

428i/328i (N20), E90 328i (N52) and similar. Often done with the water pump; see Water Pump & Thermostat for combined prices.

Symptoms

Engine slow to warm up, low temp gauge
Thermostat fault code (e.g. 2E81)
Weak cabin heat

Parts list

Thermostat (Behr / Mahle)	ECS Tuning Pelican Parts Amazon
BMW coolant	ECS Tuning Pelican Parts Amazon

Check fitment for your exact car (VIN) before ordering. Links may become affiliate links in the future.

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Common questions

How much does Thermostat Replacement cost?

Thermostat Replacement on a BMW with the N20/N52/N55 engine typically costs $450 at an independent shop or $3,200 at a BMW dealer, based on 2 real owner-reported prices.

How much does Thermostat Replacement cost at a BMW dealer?

Real dealer prices we found ranged $3,200 (1 data point, median $3,200).

How much does an independent shop charge for Thermostat Replacement?

Independent shop prices ranged $450 (1 data points, median $450).

Can I do Thermostat Replacement myself?

We have not found a DIY parts cost for this job yet.

Which BMWs are affected?

428i/328i (N20), E90 328i (N52) and similar. Often done with the water pump; see Water Pump & Thermostat for combined prices.