2002 Tundra Check Engine Light P0155


Old 12-23-02, 06:17 AM
Marshall Buttrey
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2002 Tundra Check Engine Light P0155

Not sure what I am in to with the above message. Basically it means there is a fault in the Oxygen Heater Sensor.

I went to the Chilton manual at cyberparts.com and found 3 possible causes: lean fuel mixture, rich fuel mixture, or an open circuit. I need to connet a scan tool and measure the voltage to pinpoint the problem.

What is a "scan tool", and are there alternatives ways to isolate the fault?

I have noticed no difference in the way the pickup runs, except there may be a slight reduction in fuel economy, which might point to rich fuel mixture.

Thanks in advance for any (all) help.

Marshall Buttrey
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Old 12-23-02, 06:38 AM
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Shouldnt it be still under warranty?
Old 12-23-02, 08:59 AM
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A scan tool is a device used in automotive diagnostics and costs hundreds or thousands of dollars for a good one .

You cannot read and interpret codes on OBDII vehicles like this without one (Or at minimum a code reader).

As Fordman mentioned, this is a 2002 vehicle---covered under warranty. Dealer's problem, not yours. Return it to them for free repair.

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