I have a van that needs to pass emissions.

Question

the van is throwing a code that keeps the check engine light on.

Answer 1

P1155 A/F (airflow ) sensor heater circuit malfunction ( Bank 2 Sensor 1)

This code is for the upstream 02 sensor (even though it is a A /F it most reffered to as a 02 sensor) located at Bank 2 or where cylinder 2 is located at.

P1155 is the circuit for the A/F sensor which would be located in the front as the hood is open the first 02 sensor is the sensor in question. The best 02 sensor for this would be using OEM,

 Here the location For Bank 2 Sensor 1. , as long as this code is by itself you would just need one 02 sensor.Clear the code, set the monitor, and pass the emission test.