The Bank 1 Sensor 1, or the pre cat O2 sensor, is responsible for monitoring the oxygen content in the exhaust gas and providing an accurate voltage signal to the ECM. Show Getting an accurate voltage signal is essential, as the ECM interprets this information for adjusting the air fuel ratio. The Bank 1 Sensor 1 is also known as the upstream O2 sensor or pre cat O2 sensor. It’s located before the catalytic converter (on the exhaust manifold), on the side with cylinder #1. Note: Your engine’s Bank 1 can be located on the driver or passenger side, depending on your engine configuration, but it’s always based on the cylinder #1 position. Some engines (like an inline 4-cylinder) only have one bank. 2. How Does The Heated Oxygen Sensor Work?Every heated oxygen sensor has its own heater element circuit. The HO2S heater control circuit helps bring the sensor to the optimum operating temperature. Once running, the sensor continually communicates with the ECM to determine if the fuel is burning too rich (not enough oxygen) or lean (too much oxygen) — based on measurements in the exhaust gas. If the air-fuel ratio is rich, it will give out a voltage of 800-1000mV. If the air-fuel ratio is lean, it will generate an even smaller amount (100-200mV). Once this information reaches the ECM, it releases more or less fuel to balance the air-fuel mixture. DTC No.DTC Detection Condition Trouble Area P0037 P0057 Heated oxygen sensor (HO2S) heater current less than 0.3 A (1 trip detection logic)
P0058 Heated oxygen sensor (HO2S) heater current more than 2 A (1 trip detection logic)
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, including but not limited to Toyota, VW, Ford, Dodge, Honda, Chevrolet, Hyundai, Audi, Acura, etc. Specific repair steps may vary depending on the model. Fuel injected vehicles use heated oxygen sensors in the exhaust system before and after the catalytic converters to determine oxygen content. This feedback is used to adjust the fuel system accordingly to maintain a proper air/fuel ratio of 14.7:1. The oxygen sensors used a heated circuit to warm up the sensor for faster feedback operation. The oxygen sensor may use three or four wires depending on the vehicle, two are usually used for the sensor feedback to the Powertrain Control Module (PCM) / Engine Control Module (ECM) and the other wires are for the heater to power the heated circuit. Three wire sensors are usually grounded through the exhaust system, and four wire sensors have a seperate ground wire. The P0036 code refers to the sensor after the catalytic converter on bank 1, which is on the side of the engine with the #1 cylinder. The heater circuit may be supplied power or ground by the PCM/ECM or another source that can be controlled by the PCM/ECM. Note: Be careful not to work around an exhaust system that has been ran recently as they can become very hot. This code is similar to P0030 and basically identical to P0056. SymptomsSymptoms of a P0036 DTC includes MIL (Malfunction indicator lamp) illumination. You will probably not notice anyother symptoms associated with the failure of the heated circuit since it only runs momentarily when the vehicle is first started. This sensor is also after the catalytic converter, so it will not affect the air/fuel ratio input to the PCM/ECM; it is primarily used to verify the catalytic converters efficiency. CausesPotential causes of a P0036 trouble code may include:
Possible SolutionsVisually inspect the oxygen sensor wiring for damaged or loose wiring to the sensor. Unplug the oxygen sensor and using a digital volt ohm meter (DVOM) set to the ohms scale, test the resistance of the heater circuit using a wiring diagram for reference. The heater circuit inside the sensor should have some resistance present, excessive resistance or an over limit reading would indicate an open in the heated portion of the circuit and the oxygen sensor will need to be replaced. Back-probe the ground wire at the connector and check for resistance between a good known ground and the connector to the oxygen sensor. Back-probe the power supply wire at the connector with the DVOM set to DC volts with the positive lead on the power supply wire and the negative lead at a good known ground to check for power to supply at the oxygen sensor. If no power is present at the connector during initial car startup (cold start), there may be a problem with the power supply circuit to the oxygen sensor or the PCM itself. Related DTC Discussions
Need more help with a p0036 code?If you still need help regarding the P0036 trouble code, please post your question in our FREE car repair forums. NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected. How do you fix HO2S heater control circuit low?If the battery feed is intact, remove the ground (control) circuit from the ECM wiring connector and check for resistance on the circuit. If there is infinite resistance, repair open in the circuit. If the control circuit checks out, suspect a bad O2 sensor. Replace the sensor and re-check.
What is the HO2S heater control circuit?Diagnostic Trouble Code (DTC) P0030 stands for “HO2S Heater Control Circuit (Bank 1, Sensor 1).” It may be triggered when your vehicle's control module detects a fault in the heater circuit in oxygen sensor Bank 1, Sensor 1. Bank 1 is where cylinder number 1 is located.
What code is bank 1 sensor 2?Diagnostic trouble code (DTC) P0136 stands for “O2 Sensor Circuit (Bank 1, Sensor 2).” It refers to the same malfunction as the engine code P0137, except it applies to the second O2 sensor on Bank 1.
What causes heater control circuit low?Having experienced this problem in the past, the most common problem is damage to the sensor wiring, either from improper installation or the wiring clamps failing causing the wires to touch the exhaust system, including the catalytic converter which is the hottest part of the exhaust.
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Ho2s heater control circuit bank 1 sensor 2
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