Hmm, the check engine light came on (yet again), but my car was running fine. The code was a P1131. Which is a Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1. How do I fix that? Where is the switch at, because I'm think it's the switch that might need to replace or replug or whatever? Could it be the connector where the O2 sensor plugs into? Also, where is bank 1...on the driver side or passaneger side?

Thanks

PS I know....lots of questions. lol I'm Bad yall! lol

 

here was my solution to fixing all that carp....and more...

https://mustangforums.com/m_2743415/tm.htm

 

Umm, naw man, I already did my head gasket, so no way I'm gonna spend more money on swapin' engines. lol Naw seriously, if i already change out the o2 sensors (both), today like 30 mins ago I swap out my old MAF with a new one. (cause it was dirty...checkout my past post), so, I just went out of town and drove it for 2 days before the weekend. Came home today, arrive in town, and bang the check engine light came on. So, when I clean the MAF last week, it had to have some effect with the CEL (check engine light) So, that's today I replace the damn thing with a new one.