P0436 OBD-II Trouble Code: Catalyst Temperature Sensor Range/Performance (Bank 2)

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Cost of diagnosing the P0436 code

P0436 is a diagnostic trouble code (DTC) for "Catalyst Temperature Sensor Range/Performance (Bank 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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Diagnostic Trouble Code (DTC): P0426

P0426 code definition

The P0426 code indicates that a catalyst element for engine bank 2 is not operating as efficiently as it should be.

What the P0426 code means

In order to measure the efficiency of each catalyst in each converter, the PCM gathers data from a variety of sensors, particularly the upstream and downstream oxygen sensors. The upstream sensor reading fluctuates with the fuel conditions, while the downstream sensor reading stays fairly steady. If at any time, the readings from the sensors are too similar for engine bank 2, or do not fall within the manufacturer’s parameters, the P0426 code will be stored.

What causes the P0426 code?

The most common cause of the P0426 code a faulty catalytic converter. Other causes may include:

  • Faulty temperature sensor
  • Bad oxygen sensor
  • Open or shorted temperature sensor harness
  • Poor electrical connection within the temperature sensor circuit

However, these causes are rare. Under the umbrella of “faulty catalytic converter”, there are several underlying causes that could be ultimately to blame. These include:

  • Using the incorrect fuel
  • Contaminated oil
  • Faulty spark timing
  • Leaking exhaust manifold
  • Faulty coolant temperature sensor
  • Faulty fuel injection component
  • Leaking down pipe
  • Leaking flex hose
  • Faulty mass air flow sensor
  • Faulty manifold air pressure sensor
  • Faulty pressure regulator

What are the symptoms of the P0426 code?

In many cases, the only symptom that a vehicle owner may observe is the illumination of the Check Engine Light. However, if any of the converter components have melted or broken, there may also be a decrease in engine performance, or a hissing noise during acceleration. In some cases, the vehicle may fail to start at all.

How does a mechanic diagnose the P0426 code?

After verifying the code with an OBD-II scanner, the mechanic should perform a visual inspection of all the electrical components, looking especially for corroded or loose elements, and the exhaust system for leaks. If an issue is present in either area, this issue should be repaired, and the code should be cleared and the system retested.

If, after these two diagnostic procedures, the code returns, it is most likely that the catalytic converter is bad. The mechanic should continue attempting one repair at a time, clearing the code and retesting as they go, to ensure they pinpoint the problem. This process will ensure that no unnecessary repairs are made.

Common mistakes when diagnosing the P0426 code

In most cases, the biggest issue that technicians report is a previously repaired converter that did not have the underlying cause addressed. Without addressing the cause of the faulty converter, a new converter will likely fail again in a short time.

The next most common issue is a mistakenly blamed oxygen sensor. Because an oxygen sensor code can be present at the same time as the P0426 code, mechanics may replace this part right away; but the oxygen sensor should be tested for proper operation before it is replaced, because it is usually not to blame.

How serious is the P0426 code?

If the P0426 code is being detected, the vehicle should still be drivable. Unless there are serious breakages or melted parts within the converter components, this is not an emergency issue. It may, however, affect the vehicle’s ability to pass an emissions test, and it should be repaired when time allows.

What repairs can fix the P0426 code?

In most cases, repairing the faulty catalytic converter, and repairing the underlying issue that caused the fault, will fix the P0426 code. Other repairs may include:

  • Replacing a faulty temperature sensor
  • Repairing an open or shorted temperature sensor harness
  • Repairing a poor electrical connection within the temperature sensor circuit

Need help with a P0426 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

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