1999 Toyota Sienna Code P0135

1999 TOYOTA SIENNA
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Computer code P0135
1999 Toyota Sienna 6 cyl Front Wheel Drive Automatic 85k miles
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Need help. There is a check engine code P0135. Where is this sensor located in the engine compartment? How easy can it be replaced, DIY? Is this a sensor only bought at the dealer? If not, where online? Thanks!
Jul 4, 2008 at 9:55 AM
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MELTILLIS
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P0135 O2Sensor Heater Circuit Malfunction (Bank #1 Sensor #1)

This is a heater built into the oxygen sensor in the exhaust system. Bank 1 Sensor 1 is located in the exhaust next to the firewall / cab of the vehicle. Make sure vehicle is cold when working on this item the exhaust is extremely hot after the engine has run for just a short time.
Dec 6, 2008 at 11:28 PM