When a vehicle throws a Honda Code P0159, it can be a daunting task to determine the cause and the solution. This code is identified as Front Secondary HO2S (Bank 2, Sensor 2) Slow Response and is often triggered when the front secondary HO2S output drops to the response deterioration judgment threshold value and the response characteristics measurement is finished. To understand the cause and the solution of the Honda Code P0159, the engine coolant temperature needs to be 156 ºF (69 ºC), the intake air temperature -13 ºF (-25 ºC), the engine speed 1,180-2,000 rpms and the vehicle speed is 30 mph.
Causes and Solutions for Honda Code P0159
| Cause | Solution |
|---|---|
| Poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM | Check and secure all connections and terminals. |
| Faulty Front Secondary HO2S (Bank 2, Sensor 2) | Replace the secondary HO2S (Sensor 2). |
| Faulty PCM | Replace the PCM. |
| Coolant temperature, intake air temperature, engine speed and vehicle speed not in range | Check engine temperature, intake air temperature, engine speed and vehicle speed and adjust accordingly. |
When a Honda Code P0159 is thrown, it can be difficult to diagnose the cause of the problem and determine the solution. This code is triggered when the front secondary HO2S output drops to the response deterioration judgment threshold value and the response characteristics measurement is finished. The engine coolant temperature needs to be 156 ºF (69 ºC), the intake air temperature -13 ºF (-25 ºC), the engine speed 1,180-2,000 rpms and the vehicle speed is 30 mph for the code to be triggered. There are a few potential causes that can lead to the Honda Code P0159, from poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM to a faulty front secondary HO2S (Bank 2, Sensor 2) or a faulty PCM. Understanding the causes and solutions of Honda Code P0159 is essential in order to properly diagnose and repair the issue.
Poor Connections or Loose Terminals at the Secondary HO2S (Sensor 2) and the PCM
One of the possible causes of the Honda Code P0159 is poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. When this happens, the signal is not received correctly, and the code is triggered. The solution is to check and securely tighten all connections and terminals.
Faulty Front Secondary HO2S (Bank 2, Sensor 2)
Another potential cause is a faulty front secondary HO2S (Bank 2, Sensor 2). When the sensor fails, the code is thrown. The solution for this is to replace the secondary HO2S (Sensor 2).
Faulty PCM
The third potential cause is a faulty PCM. The solution is to replace the PCM.
Coolant Temperature, Intake Air Temperature, Engine Speed and Vehicle Speed Not in Range
The last potential cause is the engine coolant temperature, intake air temperature, engine speed and vehicle speed not being in range for the code to be triggered. The solution for this is to check the engine temperature, intake air temperature, engine speed and vehicle speed and adjust accordingly.
Conclusion
When a Honda Code P0159 is thrown, it is important to diagnose the cause and determine the solution. There are a number of potential causes of the Honda Code P0159, from poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM to a faulty front secondary HO2S (Bank 2, Sensor 2) or a faulty PCM. Understanding the causes and solutions of Honda Code P0159 is essential in order to properly diagnose and repair the issue.
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