CEL on with P0150 code

[Jozef Zoldos]

First time poster and a novice DIY guy so please excuse my ignorance.

I just picked up a 2011 Expedition w/ 130K miles and the CEL is on. I ran a scan and a P0150 code came up (O2 Sensor, Bank 2 Sensor 1). The top 2 recommended fixes are to flash the PCM (powertrain control Module) and to change the affected O2 sensor. I have a couple of questions.

1/ is flashing the PCM necessary?

2/ should I change both upstream O2 sensors while I am at it? What about the downstream sensors?

3/ Also looking for recommendations for where to get O2 sensors and what brands to look for.

Thanks.

JZ

 

[stamp11127]

Welcome to the site.

It would be better &cheaper to diagnose the cause of the code instead of tossing parts. Have you proven an O2 sensor failure?

https://www.obd-codes.com/p0150

 

[Jozef Zoldos]

Thanks. Found this very helpful. Followed the article and it was my Oxygen sensor that was a problem. I changed the sensor and codes cleared.