o2 sensor question - code p0139

[liquidimports84]

Originally Posted by Lew

PO139 code is an aging (dying) sensor. Don't understand why it would effect your cars hesitation on acceleration. The 02 sensor monitors the efficiency of the cat. Clear the code and do a spirited drive....and then check for the code again. Might go away and not come back.

The engine light went away after i messed with o2 sensor. Still i have some hesitation when accelerating

According to https://www.yourmechanic.com/article/p0139-obd-ii-trouble-code-o2-sensor-circuit-slow-response-bank-1-sensor-2

What are the symptoms of the P0139 code?

The engine may stall or run rough on deceleration if excessive fuel is getting in the engine.

The Check Engine Light will come on.

The engine may hesitate upon acceleration after a deceleration phase.