BMW 4 Series Front Bumper: Fitment, Sensors & Common Damage

On the 4 Series, a dealer's stone impact diagnosis genuinely typically isn't covered under warranty, and a working used sensor can often be sourced more cheaply.

Illustration for editorial purposes

OEM Part Numbers

Accuracy note: genuinely worth knowing: front bumper damage on a 4 Series is also a good moment to inspect the crash structure behind it — the foam impact absorber and mounting brackets can be damaged even when the visible cover looks salvageable, and replacing the cover alone without checking these hides a genuine safety issue.

More Than Just a Plastic Panel

Modern front bumpers routinely integrate parking sensors, adaptive cruise control radar, and fog light housings, which means replacing one after even minor impact damage often involves more than a straightforward swap.

Before you buy: bumper specification varies significantly by trim, particularly around parking sensor cutouts, radar mounting points and fog light provisions. Always confirm against your VIN before ordering.

What It Does

Beyond absorbing minor impacts, the front bumper on higher trims of the 4 Series often houses parking sensors, the radar sensor used for adaptive cruise control, and fog lights. A bumper that looks compatible can still be missing the correct cutouts or mounting provisions for your specific trim's equipment.

BMW 4 Series Front Bumper reference plate

Generations & Colour

Standard trims	Alpine White (no-cost), Jet Black, Black Sapphire, Mineral Grey
M4	Isle of Man Green and Toronto Red are popular performance-trim shades; significantly different front bumper with larger air intakes than standard trim

A Genuinely Useful Piece of Context Worth Knowing About Parking Sensor Faults — BMW 4 Series Front Bumper

If a parking sensor has failed and a dealer has diagnosed stone impact damage, this is genuinely worth knowing: this specific diagnosis typically isn't covered under warranty, and a genuinely working used or aftermarket replacement sensor can often be sourced considerably more cheaply than a dealer's own parts price on related models.

A genuinely useful diagnostic technique worth trying first: with the ignition on and the car in reverse, putting your ear close to each sensor should reveal a faint clicking sound from every working sensor — the one that stays silent is the faulty one.

It's also genuinely worth knowing that a persistent parking sensor fault has, in documented cases, survived recalibration, software updates, and even a brand new sensor, with the actual underlying cause ultimately turning out to be the wiring harness itself.

Common Damage, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Front Bumper Guide for common damage types to check for, confirming fitment against your VIN, and the sensor-calibration risk with cheap aftermarket covers.

More BMW Front Bumper

The same part, covered across other BMW models.

BMW 4 Series Front Bumper: Fitment, Sensors & Common Damage

OEM Part Numbers

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A Genuinely Useful Piece of Context Worth Knowing About Parking Sensor Faults — BMW 4 Series Front Bumper