The hot exhaust makes wiring harnesses brittle, and road debris can damage them. Wiring issues are a VERY COMMON cause for P0036. Pay extra close attention to where the harness may have come into contact with something. Since the PCM is not getting a response from the heated oxygen sensor circuit, check the wiring harness for damage. Here are the most common causes of P0036 in the Toyota Yaris, presented to you in a somewhat proper order of diagnosis: 1. If your Yaris had P0030 (the Bank 1 Sensor 1 version of this code), there would be more noticeable symptoms. You probably won’t notice any drivability issues with your Yaris since B1S2 is there to verify the catalytic converter is doing its job. The heated element in the oxygen sensor enables closed-loop operation faster, decreasing engine emissions. It’ll be right after the catalytic converter. Start from bank one and follow the exhaust. You only need to concern yourself with “banks” if there is more than one cylinder head (4 cylinders and inline-six engine owners can skip this part).īank one is usually the cylinder head facing a little more forward than the other (toward the engine accessories). P0036 doesn’t usually cause drivability issues Bank Oneīank one is the part of your Yaris’s engine with the first cylinder. In the case of P0036, the PCM has detected a fault in the circuit that activates the oxygen sensors heater. The PCM uses this data to adjust the air-fuel mixture to the optimal 14.7 parts air to 1 part fuel. The A/F sensor is responsible for measuring the oxygen content of the exhaust. The heated element reduces emissions by letting the fuel trim enter closed loop operation more quickly. The heated element within the oxygen sensor heats the sensor faster than the exhaust can. P0036 indicates no signal coming from your Toyota Yaris’s Bank1 Sensor 2 oxygen sensors heater circuit. P0036 Definition: Heater Control – Circuit – B1S2 B1S2 is downstream of the catalytic converter and primarily checks exhaust gas content for emissions purposes. Your Yaris’s engine relies heavily on the upstream sensor for engine tuning. P0036 should NOT be considered a breakdown risk if it appears by itself. This code is almost always caused by a bad heated oxygen sensor or wiring issue and is almost always symptom-free. It’s generic, which means it has the same definition for the Toyota Yaris as any other vehicle. P0036 is a very common O2 sensor-related trouble code.
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