P1442: On Toyota, secondary air injection switching valve No. 2 stuck closed (bank 1)
Secondary air injection switching valve stuck closed, bank 1
Severity: Severity not verified — if the car runs badly, have it inspected
The fault stops fresh air being pushed into the exhaust during warm-up, an emissions matter, but none of our sources rate how long it is safe to keep driving.
P1442 in short
On Toyota trucks and SUVs with the 4.7 L V8, P1442 means the secondary air system switching valve on bank 1 is stuck closed. Toyota says debris from the air pump can contaminate the system, and owners were quoted a new pump. No source rates driving safety, so have it checked.
The secondary air system blows fresh air into the exhaust for a short time after a cold start so the catalytic converters warm up faster. Valves on each bank open to let that air through.
P1442 is set when the computer sees the bank 1 switching valve No. 2 is not opening when it is told to. Toyota bulletin T-SB-0230-12 lists it with P1445, the bank 2 equivalent, on 2005-2009 4Runner, 2006-2007 Land Cruiser, 2005-2007 Sequoia and 2005-2006 Tundra with the 4.7 L 2UZ-FE engine.
The bulletin says debris passing through the air injection pump assembly can contaminate parts of the system. Two owners with this code on a Tundra and a Sequoia were told by a dealer that the air injection pump was the problem.
Pick your make
P1442 is a manufacturer-specific code: its meaning depends on who built the car.
Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.
Most likely causes
Cause 1: Debris from the air injection pump contaminating the valves
Supported by vehicle data- Why it ranks here
- Toyota bulletin T-SB-0230-12 names debris through the pump as the cause of these codes on the 2UZ-FE, and two dealers diagnosed the pump on trucks storing P1442 with P1445.
- What would change this
- Rises if P1445 is stored with it and the pump hums loudly at cold start. Falls on a vehicle outside the bulletin range.
Cause 2: Switching valve stuck closed for another reason
Possible — needs testing- Why it ranks here
- The code names the valve itself, so a stuck valve without pump debris is possible, but no source we read describes that case.
- What would change this
- Rises if the pump runs normally and the valve fails its own test. Falls if the pump is damaged.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Read all stored codes and check the vehicle against the bulletin range (4.7 L 2UZ-FE, listed years). Note whether P1445 is stored and whether the air pump hums loudly right after a cold start.
IfP1442 and P1445 are both stored on a listed 4.7 L model
It meansToyota names pump debris as the cause; have the system inspected.
IfOnly P1442 is stored or the vehicle is outside the range
It meansTest the valve and its circuit before replacing the pump.
Step 2: Have a Toyota dealer or emissions technician run the secondary air system test from Toyota service information and check the pump and valves for debris.
Warning:The exhaust and air pipes are very hot after the engine has run and the pump can start by itself during a test. Keep hands and tools clear, and do not run the pump with the air hoses removed.
IfThe pump or valves contain debris
It meansThe pump and affected parts are replaced per the bulletin.
Points to: Debris from the air injection pump contaminating the valves
IfThe pump is clean
It meansThe valve or its control circuit is tested next.
Symptoms
- Check engine light
- Loud humming or supercharger-like noise from the engine after a cold start
How to fix
Parts and cost context
- Secondary air injection pump assembly:Owners were quoted a new pump at a Toyota dealer; labor varies, so get a quote and ask whether a bulletin applies.
Labor varies by vehicle and shop; get a quote before you approve a repair.
Compare used part prices on PartPriceGuideOn your vehicle
ToyotaYour car
2005–2006 · Tundra · 2UZ-FE
Supported by vehicle dataToyota bulletin lists P1442 on 4.7 L Tundras; an owner stored P1442, P1445 and P2441 with a humming air pump and was quoted a new pump.
2005–2007 · Sequoia · 2UZ-FE
Supported by vehicle dataToyota bulletin lists P1442 on 4.7 L Sequoias; a dealer diagnosed an air injection pump problem on a 2005 with P1442 and P1445.
2005–2009 · 4Runner · 2UZ-FE
Supported by vehicle dataToyota bulletin lists this code among secondary air codes on 4.7 L engines.
2006–2007 · Land Cruiser · 2UZ-FE
Supported by vehicle dataToyota bulletin lists this code among secondary air codes on 4.7 L engines.
T-SB-0230-12 RevStatus unverified
Secondary air injection codes on 4.7 L engines
2005–20094runner, land-cruiser, sequoia, tundra · 2UZ-FE · NHTSA 10132097
Debris passing through the air injection pump assembly can contaminate the system and set secondary air codes including P1442 and P1445; the bulletin gives a repair procedure.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Related codes
P1442 questions
What does P1442 mean on a Toyota?
On Toyota 4.7 L trucks and SUVs it means the bank 1 secondary air injection switching valve No. 2 is stuck closed. Other makes use the code for different faults, such as evaporative leaks.
Sources and review
- Toyota bulletin T-SB-0230-12 (Rev): secondary air injection codes on 2UZ-FE 4.7 L engines
- NHTSA complaint ODI 10497961 (2006 Toyota Tundra)
- NHTSA complaint ODI 10520439 (2005 Toyota Sequoia)
- P1442 manufacturer-specific definitions
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error