What causes the check engine llight and Vsc light to go on in a sequioa

Asked by Oct 24, 2014 at 09:12 PM about the 2005 Toyota Sequoia Limited 4WD

Question type: Maintenance & Repair

1 Answer

20

you would need to tell me what code numbers you see but The P0442 code is your primary failure code. This means there is a small leak that has been detected in the evaporative emission system. The P0441 and P0446 code normally will set by default whenever there is a leak in the system. When the evaporative system runs its self test it cannot monitor the pressures accurately and this is where the 441 and 446 codes normally come in place. The most common issue is usually related to the gasket being left loose or corrosion at the ceiling point of the gas. If you are certain that that is not the issue your only option is to have the system tested with a vapor canister smoke machine which applies a smoke into the system under pressure. Then you have to locate the leak. In some rare cases I have seen the welds crack on the tubes that go up to the fuel filler neck. Regarding the P0051 code this means the heater circuit in bank two sensor one has failed for the oxygen sensor. Bank two on this engine is the passenger side. This sensor is located in the exhaust pipe just down from the exhaust manifold. 95% of the time this ends up just being a bad sensor. If you replace the sensor yourself and it breaks loose and then freezes do not force it. Get some brake fluid and squirt it on the base of the sensor and the threads in the manifold let it set for about 10 min. then work it back and forth and it should come right out. Yes I did say reak fluid . Low pressure in canister or it is not purging correctly possible due to a vacuum leak. Could be a malfunction in VSV for EVAP, VSV for vapor pressure sensor or vapor pressure sensor. Or vacuum hose cracked, blocked, etc, charcoal canister leak, cracked fuel tank overflow check valve. The issue with the wheel noise is most likely not related to this code. Does the clicking noise occur when making slow speed turns? The TRAC and VSV lights may automatically come on with the CEL. This would be to reduce engine loading.

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