PERFORMANCE / EST. 2026
← All guides

Troubleshooting

G22/G42 hard starting and rough idle: include EVAP in diagnosis

A tank-ventilation fault can accompany rough running. Keep the fault record and confirm the cause before replacing coils or a purge valve.

GUIDE OVERVIEW

Difficulty
Introductory · 1/5
Time
2 MIN READ
Vehicle / platform
G22 · G42

APPLIES TO

  • G22430i / 430i xDrive · M440i · M440i xDrive
  • G42230i · 230i xDrive · M240i · M240i xDrive

ENGINE · B46 / B58 / B48

Check full compatibility for model-year, engine and equipment limits.

Full compatibility

G22 — 430i / 430i xDrive

Make
BMW
Model years / scope
2021–2024
Engine
B46D
Drivetrain
Confirm the listed model and source application; no additional drivetrain variants inferred.
Region
US technical material unless noted

Sources 1

G22 — M440i

Make
BMW
Model years / scope
2022–2024
Engine
B58D
Drivetrain
RWD
Region
US technical material unless noted

Sources 1

G22 — M440i xDrive

Make
BMW
Model years / scope
2021–2024
Engine
B58D
Drivetrain
xDrive
Region
US technical material unless noted

Sources 1

G42 — 230i

Make
BMW
Model years / scope
2022–2025
Engine
B48D (as listed in bulletin)
Drivetrain
RWD
Region
US technical material unless noted

Sources 1

G42 — 230i xDrive

Make
BMW
Model years / scope
2023–2025
Engine
B48D (as listed in bulletin)
Drivetrain
xDrive
Region
US technical material unless noted

Sources 1

G42 — M240i

Make
BMW
Model years / scope
2023–2025
Engine
B58D
Drivetrain
RWD
Region
US technical material unless noted

Sources 1

G42 — M240i xDrive

Make
BMW
Model years / scope
2022–2025
Engine
B58D
Drivetrain
xDrive
Region
US technical material unless noted

Sources 1

Preserve the fault record

Save the exact messages and scan report before clearing faults. The bulletin includes mixture-control and tank-ventilation faults, such as 118001 and 190F08. A code points toward a diagnostic system; it does not authorize a part replacement by itself.

Sources 1

What to ask the workshop

Have the EVAP system tested and the valve assessed against the vehicle-specific procedure. Record when starting or idle trouble occurs. Do not disconnect vapor hoses or use improvised tests around fuel vapors.

Sources 1

Keep coverage separate from diagnosis

This is a component-specific warranty document, not an instruction to replace every valve or a recall notice. Eligibility and any related repairs need VIN-specific confirmation. The applications here intentionally omit ambiguous or unverified rows.

Sources 1

Sources / references 1
  1. BMW SIB 01 01 26 — G2x/G42 purge-valve faults, May 2026 ↗Reviewed Sep 27, 2026

Questions about this guide?

Share your vehicle details and what you have tried. Community posts are moderated; technical answers require verification.

Related discussions → · Ask a question →
SHARE GUIDEX ↗Facebook ↗

KEEP READING

MORE FROM PHTM

Troubleshooting

BMW battery keeps discharging: preserve the evidence

What to record before replacing a discharged 12 V battery, and why energy diagnosis matters before registration or programming.

READ GUIDE →
Troubleshooting

Uneven tire wear: what to check before alignment

Compare wear across the tire and separate pressure, alignment and mechanical checks without diagnosing a suspension part from tread alone.

READ GUIDE →
How-To

Check tire pressure without using the wrong number

Find the correct cold-pressure reference, check each axle and understand why a quiet TPMS light is not a pressure measurement.

READ GUIDE →
Quick Reference

Punctured tire: repair candidate or replacement?

Understand the limits of a puncture repair before relying on an outside plug or judging damage from a photograph.

READ GUIDE →