2007-2014 BMW N54 (135i/335i/535i/Z4) Smog Check
2007-2014 BMW N54 (135i/335i/535i/Z4) owners: known smog-related issues. BMW N54 twin-turbo engines (335i, 535i, 135i, Z4) common: charge pipe failures, VANOS solenoid codes, oil consumption affecting O2 sensors. Address oil leaks + replace failed charge pipe before testing.
What you should know
BMW N54 twin-turbo engines (335i, 535i, 135i, Z4) common: charge pipe failures, VANOS solenoid codes, oil consumption affecting O2 sensors. Address oil leaks + replace failed charge pipe before testing.
Common questions
Are 2007-2014 BMW N54 (135i/335i/535i/Z4) vehicles having smog issues?
BMW N54 twin-turbo engines (335i, 535i, 135i, Z4) common: charge pipe failures, VANOS solenoid codes, oil consumption affecting O2 sensors. Address oil leaks + replace failed charge pipe before testing.
What should I do before smog testing?
Address active codes, drive 100+ miles to complete readiness, consider pre-test diagnostic at our test+repair locations.
CAP repair assistance available?
Yes if income-qualified — up to $1,200 toward smog repair via bar.ca.gov/online_services/cap.