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This code means that the air/fuel sensor 1 (located in the exhaust manifold) is sending a high voltage signal to the engine control module (ECM). This can be caused by a number of factors, including:
* A faulty air/fuel sensor
* A problem with the wiring to the sensor
* A problem with the ECM
What are the symptoms of this code?
* The engine may run rough or stall.
* The fuel economy may be poor.
* The check engine light may be on.
How to diagnose this code
The first step in diagnosing this code is to check the air/fuel sensor. This can be done by using a multimeter to measure the voltage output of the sensor. The voltage should be between 0 and 5 volts.
If the voltage output of the sensor is outside of this range, then the sensor is faulty and will need to be replaced.
If the voltage output of the sensor is within range, then the next step is to check the wiring to the sensor. This can be done by visually inspecting the wiring for any damage. If there is any damage to the wiring, then it will need to be repaired.
If the wiring to the sensor is in good condition, then the next step is to check the ECM. This can be done by using a scan tool to communicate with the ECM. The scan tool will be able to display the data that the ECM is receiving from the sensor.
If the data from the sensor is not correct, then the ECM will need to be replaced.
How to fix this code
The fix for this code will depend on the cause of the problem. If the sensor is faulty, then it will need to be replaced. If the wiring to the sensor is damaged, then it will need to be repaired. If the ECM is faulty, then it will need to be replaced.
