The pcm detected a malfunction in the heater circuit of the. While p0141 affects the downstream sensor that monitors catalytic converter efficiency, p0135 affects the upstream. Code p0135 means this heater is drawing incorrect current, taking too long to warm up, or has an open or shorted circuit.
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If your check engine light shows p0135 or a related oxygen sensor code, think of it as a clue about a circuit or feedback.
Unlike p0141 (downstream sensor), this.
Code p0135 is most often caused by issues within the heater circuit of the upstream oxygen sensor on bank 1 While the sensor itself is. The most common confirmed repair for p0135 is replacement of the upstream o2 or a/f sensor — the internal heater.
