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P0455

BMW 3 Series GuideLow Severity

P0455 on BMW 3 Series: Symptoms, Causes & DIY Fix

Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting BMW 3 Series vehicles equipped with 2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP).

DIY Parts Estimate

$15 - $250 (DIY: $15 - $50)

3 Series Direct Fit

Shop Labor Quote

$180 – $380

Based on $175/hr labor

Drivability Status

Drivable (Short Trip)

Low urgency level

Est. DIY Time

45 – 90 Min

Basic hand tools

Check P0455 On Another BMW Model:

BMW 3 Series BMW 5 Series BMW 7 Series BMW X3 BMW X5 BMW X7 BMW M3 BMW M5 BMW i4

1. Symptoms of P0455 on BMW 3 Series

When the Engine Control Module (ECM/PCM) on your BMW 3 Series (2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP)) logs fault code P0455, drivers commonly observe:

Check Engine Light on on BMW 3 Series (2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP))

Gas cap loose warning message on dashboard on BMW 3 Series (2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP))

Slight fuel vapor odor near rear of vehicle on BMW 3 Series (2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP))

BMW 3 Series OBD-II Port Location

The 16-pin diagnostic connector is located Behind fold-down trap door in driver footwell (A-pillar base). Plug in your scan tool to verify freeze-frame sensor values.

2. Most Likely Causes on BMW 3 Series

Historical warranty claims and technical repair bulletins for BMW 3 Series point to the following failure distribution:

55%

Missing, loose, or cracked gas cap seal (BMW OEM Part)

25%

Faulty EVAP purge control solenoid (BMW OEM Part)

12%

Stuck open EVAP vent valve (BMW OEM Part)

Cracked EVAP charcoal canister vapor hose (BMW OEM Part)

3. Step-by-Step DIY Repair Guide for BMW 3 Series

Inspect and Tighten the Gas Cap

Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the BMW 3 Series equipped with 2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP).

Required Tool: None

Replace Gas Cap with OEM Replacement

If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the BMW 3 Series equipped with 2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP).

Required Tool: New OEM Gas Cap

Test EVAP Purge Solenoid Under Hood

Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the BMW 3 Series equipped with 2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP).

Required Tool: 12V Probe, Vacuum Pump

Inspect EVAP Canister Vent Valve Near Gas Tank

Check vent valve for road salt corrosion or spider nest clogs. on the BMW 3 Series equipped with 2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP).

Required Tool: Flashlight, Jack Stands

Smoke Test EVAP System

Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the BMW 3 Series equipped with 2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP).

Required Tool: EVAP Smoke Machine

4. BMW 3 Series P0455 FAQs

What causes code P0455 to trigger on a BMW 3 Series?

On the BMW 3 Series (2.0L TwinPower Turbo 4-Cyl (B48 255HP) / 3.0L Turbo I6 (B58 382HP)), P0455 is most frequently caused by Missing, loose, or cracked gas cap seal or Faulty EVAP purge control solenoid. Factory sensor degradation or wiring harness wear near the engine bay are common factors.

Can I safely drive my BMW 3 Series with code P0455?

Yes. Completely safe to drive, but emissions test will fail. Given that P0455 carries a Low severity rating on BMW vehicles, we advise performing diagnostic scanning via the OBD-II port located behind fold-down trap door in driver footwell (a-pillar base) before extended highway driving.

Where is the diagnostic port located on the BMW 3 Series?

The 16-pin OBD-II DLC connector on the BMW 3 Series is situated behind fold-down trap door in driver footwell (a-pillar base). It requires no special tools to plug in a standard scanner.

How much does it cost to fix P0455 on a BMW 3 Series?

DIY replacement parts typically range between $15 - $250 (DIY: $15 - $50). If serviced at an authorized BMW dealership, expect an additional $120–$250 in professional labor based on their $175/hr hourly rate.