P0036 Fault Code

Long Description

Fault code P0036 is logged when the engine control unit (ECU) has detected a malfunction with the bank 1 oxygen sensor 2 circuit. This is the downstream heated oxygen sensor circuit specifically.

Heated oxygen sensors have internal heater systems to allow them to reach operating temperatures quickly as they monitor oxygen in the hotter exhaust system. This downstream sensor is used to monitor the oxygen content after the catalytic converter.

This is typically done to check emissions for the vehicle.

Bank 1 refers to the side of the engine in which the number one cylinder is found. This applies only to V-shape engines. Sensor 2 is simply the downstream sensor.

All vehicles have these types of heated oxygen sensors, meaning all vehicles can be susceptible to this fault code. Manufacturers like Toyota and Hyundai are some of the more commonly reported brands to suffer from this code though.

Other Signs of This Problem

Due to the role of the downstream heated oxygen sensor, there are very few other signs that can give away the issue.

This means it is even more important to pay attention to the presence of the Check Engine light and these fault codes.

It is possible to have a slightly reduced fuel economy.

Additionally, there may be issues with the catalytic converter like overheating. Be sure to look out for other catalytic converter codes like P2096, P2097, and others.

It is also a good idea to look out for other downstream heated oxygen sensor codes like P0136 up to P0145.

What Could Be The Problem?

The potential causes for fault code P0036 are all electrical in nature. These can range from part malfunctions to improper wiring.

One of the most likely issues is a faulty downstream oxygen sensor. This will obviously provide an incorrect reading that can signal the fault code to be logged.

Additionally, there could be an issue with the wiring or connections. A frayed or damaged wire can disrupt the signal being sent.

This can also happen as a result of an open or short circuit in the wiring.

In some instances, the ECU could be faulty or running on outdated software.

Fixes

All of the fixes for P0036 are focused on fixing any existing electrical issues. However, it is a good idea to reset the codes and perform a test drive to determine if the code is logged again.

If the oxygen sensor is in fact faulty, it should be replaced. These heated oxygen sensors typically have a resistance of 6 Ohms.

The wiring and connections between the sensor and the ECU should also be checked for damage or fraying. These should be fixed accordingly. It is also important to ensure that the connections are properly fixed to the components.

Updates for the ECU should also be checked.

The fuse running to bank 1 sensor 2 should also be checked and replaced if need be.

Seriousness

Fault code P0036 can be considered low in terms of seriousness. There is no risk involved to the vehicle and driveability is not affected.

It is recommended to have this issue solved within a few weeks. This is mostly due to poor emission levels and decreased fuel consumption.

In some cases, the catalytic converter can be at risk, which can be an expensive fix.