BMW N43/N46 vs 1.5 VTi-TECH / T-GDI: which engine is more reliable?

According to our risk index, the 1.5 VTi-TECH / T-GDI carries less risk than the BMW N43/N46: 7/100 (low risk) versus 59/100 (high risk). The BMW N43/N46 has 1 documented serious fault, the main one being «Wear and breakage of the timing chain guides»; the 1.5 VTi-TECH / T-GDI has no documented serious faults.

Risk index

BMW N43/N46

High risk · 1 serious fault

Risk index

1.5 VTi-TECH / T-GDI

Low risk · 0 serious faults

Lower risk

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

Reviewed on 30 October 202618 sources How we work

Is the BMW N43/N46 reliable?

The BMW N43 and N46 (2004-2012) are naturally aspirated four-cylinder engines fitted to the 1 Series E87, 3 Series E90, X1 E84 and Z4 E85/E86, among others. They have a reputation for being solid if properly maintained, but share well-known wear of the timing chain guides and tensioner, of the Valvetronic and of the VANOS valves; the direct-injection N43 adds documented failures of the injectors, ignition coils and the NOx sensor.^[1][2][3][4]

See the 4 of the BMW N43/N46 faults

Is the 1.5 VTi-TECH / T-GDI reliable?

MG/SAIC's "1.5" covers two different engines: the naturally aspirated VTi-TECH (106 hp), the entry-level engine in the MG ZS, and the turbocharged T-GDI (162-170 hp), found only in the MG HS and as the petrol engine in its plug-in hybrids. Neither has well-documented engine faults in independent sources yet: the complaints published concern electronics, the automatic gearbox and finish, not the engine block.^{[5][6][7][8][9][10]}

See the 2 of the 1.5 VTi-TECH / T-GDI faults

Side-by-side comparison

Comparison of BMW N43/N46 and 1.5 VTi-TECH / T-GDI
Item	BMW N43/N46	1.5 VTi-TECH / T-GDI
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	—	—
Timing	Chain	Chain
Power	121–170 hp	106–170 hp
Production	2004–2012^{[1][2][11][12]}	since 2017^{[5][6][13][14][15]}
Reliability
Risk index (what is it?)	59High risk	7Low risk
Documented faults	4	2
Of high or critical severity	1	0
Worst severity	Critical severity	Low severity
Main faults	Critical severity: Wear and breakage of the timing chain guides Medium severity: Injector, ignition coil and NOx sensor failures (N43) Medium severity: Wear of the Valvetronic and the VANOS solenoid valves	Low severity: Jerky or harsh automatic gearbox shifts when cold or at low speed (MG HS) Low severity: Electronic warnings and occasional sensor faults (MG HS)
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	1.5 VTi-TECH naturally aspirated 106 hp (NSE / NSE Plus, from 2017)^[8]
With cautionVersions to be cautious about	N46B20 127-148 hp, indirect injection (2004-2007)^[3][4] N46NB20 150-170 hp, revised ECU (2006-2012)^[3][4][16] N43B16 121 hp, 1.6 litres (2007-2011)^[1][3] N43B20 121-168 hp, 2.0 litres (2007-2013)^[1][3]	1.5 T-GDI turbo 162 hp (GS61H, 2018-2024)^{[9][10][17][18]} 1.5 T-GDI turbo 170 hp (15FDE / 15FKE, from 2024)^[6]
AvoidVersions to avoid	None	None

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

BMW N43/N46

1.5 VTi-TECH / T-GDI

Other comparisons

With the BMW N43/N46

With the 1.5 VTi-TECH / T-GDI

Compare other engines

First engine

Second engine

That is the comparison you are viewing: change one of the two engines.

Sources

Every fact on this page links to its source. If you find an error, let us know.

BMW N43Wikipedia (inglés) · Other source · consulted 27 September 2026
BMW N46Wikipedia (inglés) · Other source · consulted 27 September 2026
BMW N43: Bei diesem Benziner ist Ärger vorprogrammiertGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
BMW N46: Typische Probleme & HaltbarkeitGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
MG ZS (crossover)Wikipedia (inglés) · Other source · consulted 27 September 2026
MG HSWikipedia (inglés) · Other source · consulted 27 September 2026
Essai complet : MG ZSFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité et pannes du MG ZSFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité et pannes du MG eHSFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
MG HS PHEV: guía definitiva de problemas y soluciones del SUV, el híbrido enchufable más vendidoAutopista.es · Motoring press · published 10 November 2025 · consulted 27 September 2026 · in Spanish
BMW N43Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
BMW N46Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
MG HSWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
MG HSWikipedia (francés) · Other source · consulted 27 September 2026 · in French
List of General Motors enginesWikipedia (inglés) · Other source · consulted 27 September 2026
BMW X1 E84 – Bekannte Probleme & SchwachstellenGebrauchtwagenberater · Motoring press · published 9 May 2023 · consulted 27 September 2026 · in German
MG – Common problems (llamadas a revisión de la UE y del Reino Unido)car-recalls.eu · Other source · consulted 30 October 2026
MG HS SUV (2019-2024) Exclusive 1.5T-GDI 5d: opinión de propietario (10 jun 2022)Parkers · Owners' forum · published 10 June 2022 · consulted 30 October 2026