Blinking check engine light

See this video, it may help

the o2 sensor is after the cat converter. It is a heated sensor ( HOS) that is front of the cat converter

Yes, O2 sensor may sometimes lead to engine stalling. But also make sure that the MAF sensor is working properly. Better check for codes if the CEL is blinking.

WHAT IS YOUR CODE

The check engine light is blinking usually because of a misfire which can cause damage to the cat. The blinking check engine light does not necessarily mean the the cat is damaged.

The first thing you need to do is find out what codes are causing the check engine light to come on. If there is an O2 code it will help you identify the O2 sensor. The sensors are divided into to banks. Bank one is the same side of the motor as the number one cylinder. Bank 2 is the other side of the motor. Then they are divided into sensor 1 and senor 2. Sensor 1 is always before the cat. Sensor 2 is always after the cat. So if you had an O2 code for the Bank 2 sensor 1 O2 sensor it would be the opposite side of the engine from the number one cylinder and the sensor before the cat.

IMO, your first priority should be to figure out why the engine is misfiring and causing the check engine light to blink. Solving that first may take care of the O2 issues or the O2 could be the issue.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

I can try to help. The chk engine light is generally tripped by the #2 02 sensor. The one after the cat converter. It 's purpose is to monitor the efficiecy of the cat converter. You state there is a power loss problem also. This loss of power is common when the cat converter is restricted and the exhaust can't escape as fast as needed. . You can tell the converter is bad by a sulphur smell in the exhaust, a wheezing at the tail pipe, Or, the exhaust does not immediately stop when theengine is turned off. Good Luck. Have the cat conv checked and replaced . I hope yhis is the help you needed, Ned

CHECK THE STATUS OF THE AIR FLOW SENSOR AND THROTTLE POSITION SENSOR

O2 SENSORS ARE BAD MOST LIKELY I WOULD CHANGE THEM DISCONNECT THE BATTERY FOR 5 MIN. ( IF YOU DONT HAVE A SCANNER) THIS WILL RESET YOUR COMPUTER AND SHOULD MAKE THE SERVICE ENGINE LIGHT GO OUT.

I think you will find the aftermarket Cat Conv. is the source of your problem, but without hooking up to the factory test equipment at my disposal at my Ford dealer this at best and educated guess based on 20 years of emission related work, I am a Ford certified master electronics technician

P0139 Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Slow Response This is the Catalytic Converter efficiency monitor, it is reporting that the Cat Conv is not working as it should (cleaning up the exhaust), how many miles on the car?