I recently replaced the downstream O2 sensor in my Toyota Camry. Shortly thereafter, the check engine like came on again providing the following codes:

• P1135 which I understand to be the upstream sensor.
• P1155 is a little bit tougher for me to find any information on, but it appears to be the "Coolant Temperature Sensor Circuit for Coolant Heat Storage System".

When it comes to making these types of repairs, I'm a novice but am interested in resolving these issues on my own if possible.

My two questions are:

• Does anyone know if P1135 and P1155 are related?
• If so, will replacing the O2 sensor resolve both codes?

I recently replaced the downstream O2 sensor in my Toyota Camry. Shortly thereafter, the check engine like came on again providing the following codes:

• P1135 which I understand to be the upstream sensor.
• P1155 is a little bit tougher for me to find any information on, but it appears to be the "Coolant Temperature Sensor Circuit for Coolant Heat Storage System".

When it comes to making these types of repairs, I'm a novice but am interested in resolving these issues on my own if possible.

My two questions are:

• Does anyone know if P1135 and P1155 are related?
• If so, will replacing the O2 sensor resolve both codes?