P1444 Secondary air switching valve No. 2 stuck open (Toyota, Lexus)

P1444 secondary air injection switching valve No. 2 stuck open (Toyota, Lexus 4.7 L V8)

Monitor

It is an emissions-system fault that turns the check engine light on. A Sequoia complaint reports poor acceleration with it, so watch drivability.

It gets more serious if:

  • Inspect soon: Inspect soon if the engine loses power or the traction and stability lights come on with the check engine light, as one Sequoia owner reported.

Source: how we rate severity

P1444 in short

On Toyota and Lexus 4.7 L V8 models, P1444 means the second secondary air switching valve is stuck open on bank 2. Toyota says debris from the air pump can contaminate the valves. It turns on the check engine light, and one owner reported poor acceleration, so have it checked soon.

The secondary air system blows fresh air into the exhaust at cold start to cut emissions. P1444 means the computer found the second switching valve stuck open on bank 2, as the slash pairing P1441/P1444 in Toyota's bulletin shows.

Toyota says debris passing through the air injection pump can contaminate the valves and set these codes. A 2005 Sequoia owner was told the air pump and check valves needed replacing, and a 2006 GX470 owner lists P1441/P1444 with other secondary air codes.

This page covers Toyota and Lexus only. Other makes list P1444 with different meanings, and none was verified here.

Pick your make

P1444 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

  1. Air pump debris contaminating the switching valves

    Supported by vehicle data
    Why it ranks here
    Toyota's bulletin says debris passing through the air injection pump can contaminate components and set these codes. Only the summary was read.
    What would change this
    Rises if the pump or its valves are found damaged or debris-filled. Falls if the air system tests good on a scan tool.
    How to test the secondary air pump

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all stored codes, then have the secondary air system tested with a dealer scan tool, which can run the air pumps and switching valves.

    Low riskTool: Toyota scan tool with active tests

Symptoms

  • Check engine light on
  • Poor acceleration with traction and stability lights on (reported on a Toyota Sequoia) Gets more serious: stop and have it checked.

How to fix

  1. Read all stored codes and write them down before clearing anything, so a shop can see the full set.

Parts and cost context

  • Secondary air pump:A damaged air pump can contaminate the valves, so shops often test the whole secondary air system together. Labor varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Toyota

  • 2005–2007 · Sequoia

    Supported by vehicle data

    Covered by Toyota's 4.7 L secondary air bulletin; a 2005 owner complaint reports P1444 with poor acceleration.

  • 2005–2006 · Tundra

    Supported by vehicle data

    Covered by Toyota's 4.7 L secondary air bulletin for 2005-2006 Tundra.

  • T-SB-0230-12 RevStatus unverified

    Secondary air injection codes on 2UZ-FE 4.7 L engines

    2005–20094runner, land-cruiser, sequoia, tundra · issued · NHTSA 10132097

    Lists P1441/P1444 among secondary air injection codes that may set a MIL; debris from the air injection pump can contaminate the system. The NHTSA summary does not give the full procedure.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Lexus

  • P1445On Toyota, secondary air switching valve No. 2 stuck closed (bank 2)

    Other bank Supported by vehicle data

    Toyota pairs the codes P1442/P1445 and P1441/P1444 as bank 1 and bank 2 for its two switching valve circuits in the same bulletin.

All Secondary air injection codes

Sources and review

  1. Toyota T-SB-0230-12 Rev: secondary air injection codes on 2UZ-FE 4.7 L engines — Toyota Motor Sales via NHTSA ,
  2. NHTSA complaint ODI 10630704 (2005 Toyota Sequoia, P1444) — NHTSA Office of Defects Investigation (consumer complaint)
  3. NHTSA complaint ODI 11184806 (2006 Lexus GX470, secondary air codes) — NHTSA Office of Defects Investigation (consumer complaint)
Last reviewed
Written by
Saurabh K.
Editorial review
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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

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