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Pulling a P0135 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) code means you’re dealing with a possible oxygen sensor heater element and/or associated components in this circuit. In this article, author Carlton Banks will attempt to provide a game plan for diagnosing a vehicle with this code using TechStream and a Pico scope.

This article originally published in Underhood Service, September 2015.

Read it at UndershoodService.com.

Download a PDF.