Powertrain, generic (extended)

P2441 AIR System Switching Valve Stuck Closed (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2441 flags a bank 1 secondary air valve that does not open when commanded, so pump air never reaches the exhaust ports. Toyota documents it on 2005–2009 4.7L V8 (2UZ-FE) models such as 4Runner, Sequoia, Tundra and Land Cruiser: bulletin T-SB-0230-12 traces it to debris from the air pump contaminating the valves and lists it next to faults of the No. 2 valves. Subaru names P2441 for the 2011–2015 WRX STI and tells technicians to run the diagnosis for the opposite bank as well, since the root cause may sit there. On systems with a pressure sensor the duct pressure then rises unusually high while the oxygen sensor sees no extra air. Seized valves, a faulty actuator and carbon build-up are common causes. P2440 is the stuck-open partner, P2443 the bank 2 code.

Likely causes

Valve seized closed by debris or corrosion
Valve actuator, control solenoid or vacuum supply faulty
Kinked or collapsed air hose downstream of the valve

Symptoms

  • Check engine lamp after a cold start
  • Higher cold-start emissions, failed readiness check

Repair estimate

DifficultyMediumDIY possible
Parts and labour€120–800
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

secondary air switching valvesecondary air vacuum lines

Related codes

P2440P2443P0411P0491

References: static.nhtsa.gov, static.nhtsa.gov.