Posts Tagged: Toyota emissions code

Toyota P1135 Code Explained: Causes, Fixes, and Diagnosis

Common Causes of Toyota P1135 Code Quick Summary The Toyota P1135 code indicates that the engine control module has detected a failure in the air/fuel ratio sensor heater circuit (Bank 1, Sensor 1). In most cases, the fix is replacing a faulty upstream air/fuel sensor, but wiring issues or exhaust leaks can also trigger the code. That’s why you must diagnose it properly before replacing parts. What Does the Toyota P1135 Code Mean? In my experience diagnosing Toyota drivability issues, the Toyota P1135 code is one of the more straightforward … Read More