The P0140 code persists after I have replaced the O2 sensor and EGR valve on my 1996 Park Avenue (115K). The engine, however, runs flawlessly. Besides any suggestions to remedy this problem, is it advisable to take a road trip and ignore the problem?

Sensor found and replaced. Code removed. We’ll see what tomorrow brings. Many thanks.

Persistent P0140 Code - Buick 3.8

marktwark November 21, 2019, 6:25pm 3

Hmm, I actually didn’t know there was one after the converter. I replaced the sensor just in back of the engine.

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