O2 sensor read f

2014 CHEVROLET SONIC
130,000 MILES • 1.8L • 4 CYL • 2WD • AUTOMATIC
Avatar
RODRIGOVZQZ
  • MEMBER
  • 14 POSTS
Hi. Just changed both o2 sensors on my dad's car. O2x1 oscillates from .1 to .9 as normal but the o2x2 is at .7 from start and it only goes up. Could it be that is not the right one, defective, normal reading or dirty catalytic converter. Any advice? Thanks in advance. You guys are awesome.
Images (Click to enlarge)
Attached Media
Attached Media
Sep 28, 2021 at 10:05 AM
Advertisement
Avatar
ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good afternoon,

The reading is normal.

The front sensor should vary between .1 and .9. The rear should be stable around .6 or .7. That indicates the cat converter is working processing the gases correctly. If the rear O2 was varying like the front, then the cat converter would be defective and need to be replaced.

https://www.2carpros.com/articles/how-an-oxygen-sensor-works

Your readings are good.

Roy
Sep 28, 2021 at 10:32 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.