BestCarRank
Bmw

2018 Bmw M550I

Problems, Recalls & Reliability Report

Below Average

Quick Summary

The 2018 Bmw M550I has 41 owner complaints filed with NHTSA — that's 1.0x the segment average of 41. The most common issue is air bags problems (27% of all complaints), specifically: my old 5 series 2017 had this same problem, now my 2018 m550i has the airbag problem. a warning light for no reason pops up saying “passenger restraint system malfunction” and turns off the passengers airbag, bmw will not fix it out of warranty and charges 3,000$. many people are driving around with. There is 1 recall issued for this model year. ⚠️ 2 fire reports filed.

2 fire reports

41

Total Complaints

1

Recalls Issued

—/5

Safety Stars

1.0x

vs Segment Avg

Known Problems(top 5 of 8)

AIR BAGS

11 complaints
27%
  • • My old 5 series 2017 had this same problem, now my 2018 m550i has the airbag problem. A warning light for no reason pops up saying “passenger restraint system malfunction” and turns off the passengers airbag, BMW will not fix it out of warranty and charges 3,000$. Many people are driving around with
  • • Passenger side sensor is faulty. BMW has issued Technical Service Bulletin to repair when found in warranty. The sensor will errantly warn airbag disable when person is not in seat.
  • • Passenger Restraint Warning Light has been coming on off and on and now stays on all the time. Dealer has confirmed car needs to have the OC3 mat replaced at a very high price. Car is a 2018 BMW M550ix. Apparently this has been a common problem with the BMWs.
Typical onset: 50K miles Est. repair: $500

“My old 5 series 2017 had this same problem, now my 2018 m550i has the airbag problem. A warning light for no reason pops up saying “passenger restraint system malfunction” and turns off the passengers airbag, BMW will not fix it out of warranty and charges 3,000$. Many people are driving around with”

— NHTSA complaint filing

Recalls (1)

BACK OVER PREVENTION: SENSING SYSTEM: CAMERA27/09/2019

BMW of North America, LLC (BMW) is recalling certain 2018 540d, 2018-2020 530i, 530i xDrive, 540i, 540i xDrive, M550i xDrive, M5, 530e, 530e xDrive, X3 sDrive, X3 xDrive, X3 M40i, X3 M, and 2019-2020 X4 xDrive, X4 M40i, X4 M, X7 xDrive, X7 M50i, 740Li, 740Li xDrive, 750Li, 750Li xDrive, 8 Series Convertible and Coupe 840i, 840i xDrive, M850i xDrive, X5 sDrive, X5 xDrive, X5 M50i, X6 xDrive, X6 M50i, 330i, 330i xDrive, M340i, M340i xDrive, Z4 sDrive, Z4 M40i, 740Le xDrive and 745Le xDrive, 2018-2019 640i xDrive Gran Turismo and Rolls-Royce Phantom, 2019 M850i xDrive Gran Coupe and Rolls-Royce Cullinan and 2020 Toyota Supra vehicles. The back-up camera and display settings can be adjusted such that the rear view image is no longer visible and the system will retain that setting the next time the vehicle is placed in reverse. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 111, "Rearview Mirrors."

Risk: The lack of an image in the back-up camera display increases the risk of a crash.

Fix: BMW will notify owners, and dealers will update the back-up camera software, free of charge. The recall began November 8, 2019. Owners may contact BMW customer service at 1-800-525-7417 or Rolls-Royce at 1-877-877-3735. Toyota owners may contact Toyota customer service at 1-888-270-9371.

Fuel Cost Calculator for 2018 Bmw M550I

Live EIA prices
Per year
$2,527
Per month
$211
Per mile
21.1¢
MPG
19
City driving (worst-case MPG)
$3,001/yr
Highway driving (best-case MPG)
$1,920/yr

Based on EPA fuel-economy ratings and EIA weekly retail prices (2026-07-20). Real-world cost varies with driving style, trim/engine, terrain, and traffic.

5-Year Gas Price History

EIA weekly retail data · 2021 → today
Current
$4.00
5-year low
$2.78
5-year high
$5.01
Since 2021
+27%

Source: US Energy Information Administration weekly retail gasoline prices.

Estimated Insurance Cost for 2018 Bmw M550I

Estimate only, not a quote. Modeled from NAIC + HLDI averages for a hypothetical 35-year-old driver with clean record + full coverage. Your actual quote depends heavily on your age, driving history, credit, ZIP code, and insurer.
Full coverage / year
$2,143
Full coverage / month
$179
Liability only / year
$710
vs US avg
+28%
How this estimate is calculated
US base full-coverage premium$1674
× state (US)1.00x
× vehicle class (sedan-luxury)1.28x
× theft risk1.00x
× safety rating1.00x
× vehicle age1.00x
= Full coverage estimate$2143

Coverage assumed: 100/300/100 liability + comprehensive/collision, $500 deductibles. Data sources: NAIC 2024 + HLDI loss studies.

Maintenance & Warranty

Recommended Bmw M550I Service Intervals

Oil change
10K mi / 12 mo
Tire rotation
10K mi
Brake fluid
24 months
Transmission fluid
60K mi
Engine coolant
100K mi
Spark plugs
60K mi
Cabin air filter
15K mi
Engine air filter
30K mi
Differential (AWD/4WD)
60K mi

Condition-Based Service (CBS) tells you exactly when service is due. Transmission fluid was labeled 'lifetime' but many owners service at 60K-100K.

"Severe service" conditions (heavy towing, extreme temps, city stop-and-go) typically halve these intervals. Always consult your vehicle's owner's manual for the authoritative schedule.

Bmw New-Vehicle Warranty Coverage

Bumper-to-bumper (basic)
4 yr / 50K mi
Powertrain
4 yr / 50K mi
Hybrid/EV battery
8 yr / 100K mi
Corrosion (rust perforation)
12 yr / unlimited mi
Roadside assistance
4 yr / unlimited mi

Corrosion is unlimited miles for 12 years

These are the terms for a new Bmw. If you're buying a used 2018 M550I, remaining coverage is usually pro-rated from the vehicle's original in-service date. Not all coverage transfers between owners — check with a Bmw dealer for VIN-specific remaining warranty.

Estimated Repair Costs

AIR BAGS(~50K mi)
$500
SEATS/RESTRAINTS(~50K mi)
$500
ELECTRICAL(~50K mi)
$500
DRIVER ASSIST/CAMERAS(~50K mi)
$500
BODY/STRUCTURE(~50K mi)
$500

Estimates based on average reported repair costs. Actual costs vary by location, shop, and severity.

🔍 Pre-Purchase Inspection Checklist

Based on 41 owner complaints for this specific year, here's what to check or ask about:

  • ☐
    AIR BAGS: My old 5 series 2017 had this same problem, now my 2018 m550i has the airbag problem. A warning light for no reason pops up saying “passenger restraint system malfunction” and turns off the passengers airbag, BMW will not fix it out of warranty and charges 3,000$. Many people are driving around with

    Typically appears around 50K miles. Repair cost ~$500

  • ☐
    SEATS/RESTRAINTS: Passenger side sensor is faulty. BMW has issued Technical Service Bulletin to repair when found in warranty. The sensor will errantly warn airbag disable when person is not in seat.

    Typically appears around 50K miles. Repair cost ~$500

  • ☐
    ELECTRICAL: ON 4/10/2018 VEHICLE WAS PARKED CAUGHT FIRE TOTTAL LOSE

    Typically appears around 50K miles. Repair cost ~$500

  • ☐
    DRIVER ASSIST/CAMERAS: On vacation road trip driving for about 3 hours. Instrument cluster completely shuts off and goes to black. Screen, vehit speed and rpm and all adas systems stop working. Sometimes turning the car off and on will address the issue other times it will constantly restart the instrument cluster when dr

    Typically appears around 50K miles. Repair cost ~$500

  • ☐
    RECALLS: Verify all 1 recall have been completed — free at any Bmw dealer
  • ☐
    General: Get a pre-purchase inspection from an independent mechanic ($100-$200)

Bmw M550I — Year Comparison

How does 2018 compare to other years? Fewer complaints = more reliable.

2018
41Below Average
Full years-to-avoid analysis →

NHTSA Safety Rating

No NHTSA safety rating available

At a Glance

Complaints
41
Recalls
1
Fire reports
2
Crash reports
0
Injury reports
0
Segment avg
41

Check a Specific VIN

See recalls for YOUR 2018 Bmw M550I

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