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1998 Cadillac DeVille 4.6L with engine code P0135

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Where is the P0135 O2 sensor bank 1 on my 1998 Cadillac DeVille 4.6L located on the engine?

Vehicle: 1998 Cadillac DeVille 4.6L

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The front Oxygen Sensor on your 1998 Cadillac is in front of the catalytic converter. See picture below

Cadillac DeVille Oxygen Sensor Location

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P0135 Cadillac Code - HO2S Heater Performance Bank 1 Sensor 1
Read more: https://www.autocodes.com/p0135_cadillac.html

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