Code Definition

P1135 — Air/Fuel Sensor Heater circuit response

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Toyota

About P1135

P1135 is a manufacturer-specific powertrain diagnostic trouble code recorded for Toyota vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1135 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1135 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This DTC sets when the Engine Control Module (ECM) detects a malfunction in the heater circuit of the air fuel ratio (AF) sensor, specifically for Bank 1 Sensor 1. The heater brings the sensor element up to operating temperature quickly so closed loop fuel control can begin, and the ECM monitors heater current and warm up time to confirm correct operation. If the heater circuit is open, shorted, or the sensor fails to reach temperature as expected, the ECM logs this fault. The main effect is delayed entry into closed loop, which can cause higher emissions, slightly rough cold running, and an i...

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