P0146 on 2022 Buick Encore — O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 3)
1 vehicles · 1 makes
Most Reported On
P0146 is an OBD-II diagnostic trouble code meaning “O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 3).” The PCM detects no signal activity (flat voltage) from the Bank 1, Sensor 3 O2 sensor, indicating it is not switching — often a dead sensor or open circuit at the rearmost post-catalyst position. This code is most commonly reported on 2022 Buick Encore.
Common Causes
Diagnostic Tools
To diagnose P0146, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
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LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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FAQ
What does P0146 mean?
P0146 stands for "O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 3)." The PCM detects no signal activity (flat voltage) from the Bank 1, Sensor 3 O2 sensor, indicating it is not switching — often a dead sensor or open circuit at the rearmost post-catalyst position.
What are the most common causes of P0146?
The most common causes of P0146 are: Failed Bank 1 Sensor 3 O2 sensor, Open signal or ground circuit, Disconnected connector, Blown sensor heater, Exhaust leak affecting readings. The specific cause varies by vehicle.
How much does it cost to fix P0146?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0146?
Au7o has documented P0146 across 1 vehicle models from 1 manufacturers: Buick.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.