Used BMW 523

What to know before buying: BMW 523

From 3 forum threads and 2 press tests · updated 11/10/2026

What the reviews say

• Owners describe the E39 523 as a pleasant everyday car that is relatively easy to work on.[5]one sourceE39
• The 523 engine is adequate for normal driving, but the heavy E39 lacks low-end pull and feels livelier above 4,000 rpm.[5]one sourceE39
• Condition and regular servicing matter more than the odometer: a lower-mileage car may be rotten and abused, while a higher-mileage example can be well preserved.[5]one sourceE39

Typical faults

• The E39 523 boot lid is notably prone to rust, and corrosion can return after a poor repair.[5]one sourceE39
• The original catalytic converter is reported to fail prematurely when its internal element breaks loose and obstructs the exhaust.[5]one sourceE39
• Airbag-system faults may come from the seat occupancy mat or the seat-belt pretensioner wiring.[5]one sourceE39
• At roughly 150,000 km, an owner advises allowing for wear of the water pump, thermostat, dampers and ABS sensors.[5]one sourceE39

  150 000+ km

• On one E39 523i, a failed camshaft sensor caused difficult hot starts, rough running, stalling and weak pull; initially no fault was stored.[3]one sourceE39
• On one 523i, a damaged left-rear wheel bearing and sensor ring disabled the speedometer, economy gauge, ABS and ASC.[4]one sourceE39

Which engine and version to take

• The E39 523's M52 is a 2.5-litre engine; verify the engine code, as a claimed M54 in a 1998 car was questioned in the source.[2]one sourceE39

What to check at the inspection

• Start the engine cold and fully warm, then repeat a hot start; check for rough running, stalling and loss of power.[1][3]E39
• Inspect the boot lid carefully, including previously repaired or repainted areas, because rust may return.[5]one sourceE39
• Check the ABS, ASC and airbag lamps, speedometer and economy gauge; faults may indicate an ABS sensor, wheel-bearing ring or restraint-system wiring issue.[2][4][5]E39
• Check the service history and records for water-pump, thermostat, damper and ABS-sensor replacement; do not judge the car by mileage alone.[5]one sourceE39
• Compare the fuel-level reading with the actual quantity: on one 523i, replacing the float in the right side of the tank corrected a false reading.[4]one sourceE39

Verdict

Sources

1. [1]cbc.rs — BMW E39 523i problem · forum
2. [2]cbc.rs — bmw 523i e39 m54 · forum
3. [3]bmwpower-bg.net — Виж темата - 523i проблем с горивната система? · forum
4. [4]bmwklub.sk — Problémy BMW e39 523i, pomoc a rady - Strana 3 · press
5. [5]flashback.org — Bmw 523! · press

Spotted an error? Tell us