Why does my Lexus LX 570 show the check engine and VSC lights after a cold start?

Short answer: On the LX 570, a check engine light with the VSC (stability control) and traction lights after a cold start is very often the secondary air injection system. It pumps fresh air into the exhaust for the first minute or so after a cold start to clean up emissions. When a pump, valve, driver module or wiring fails, the computer sets a code and turns off VSC as a precaution. It's usually not an engine-damage problem, but it needs fixing to clear the lights.

Symptom: After a cold start the check engine light comes on, then VSC, TRAC or 'slip' lights, and the 4LO light may blink. It may go away and come back after the next cold start.

What to check first

1. Read the codes first. P0419 (pump control circuit) and P2447 (pump stuck off) are common. Members say read the code before guessing.
2. Test each pump separately. There are two. A good pump runs loudly when powered.
3. Check the pump driver modules and their wiring. Owners note the driver is the same part as on the Tundra.
4. Check the air switching valves for moisture or sticking.

Likely causes

1. Failed secondary air pump. Common on the 5.7L V8.
2. Failed air switching valve. Moisture can make them stick.
3. Pump driver module or wiring. Worth testing before buying pumps.

What it usually costs

One owner said a Toyota dealer charged $1,750 for a pump, valves, a driver and a connector. Some owners use an aftermarket bypass kit instead; check that it's legal for emissions where you live. Prices are from owner posts.

Is it safe to keep driving?

Usually yes for normal driving. Owners note the secondary air system isn't critical to the engine. But with the VSC and traction systems switched off, the truck has less help on slippery roads, so drive carefully and get it fixed. Verify with a mechanic.

DIY or shop?

DIY for reading codes and testing pumps if you're comfortable with wiring. Replacing pumps and valves is shop work for many owners.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists no recall for the secondary air system on the Lexus LX 570 for these model years (checked 2026-10-23). Other recalls may exist for your car, so check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• NHTSA complaints: 2 keyword-matched complaints for Lexus LX 570 2008–2015 (of 25 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-23; keywords: air injection, secondary air, limp, check engine, 4LO, VSC, TRAC). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In LX570 - Secondary Air pump on IH8MUD, a 2009 owner had P0419 and P2447 with the check engine and slip lights and a blinking 4LO light that came back after cold starts. Members said to test both pumps separately and check the driver modules (the same part as on the Tundra) and the wiring, and mentioned the Hewitt bypass kit.
• In Check VSC System, engine light on IH8MUD, an owner said a Toyota dealer charged $1,750 for pump, valves, driver and connector. Members said the secondary air system isn't critical, that the VSC lights follow from it, and to read the code first.

Quick tip

Don't panic about the VSC light on these trucks. Get the code read. If it's P0419 or P2447, test the cheaper parts (driver, wiring) before buying pumps.

Vehicle focus: 2008–2015 Lexus LX 570 with the 5.7L V8 (3UR-FE). The Land Cruiser 200, Tundra and Sequoia 5.7 use similar systems.

Safety / mechanic note

With VSC off, the truck has less traction help on slippery roads. Verify with a mechanic.