P0146 on Buick
O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 3)
P0146 on Buick vehicles indicates o2 sensor circuit no activity detected (bank 1, sensor 3). Au7o has documented this code across 1 Buick model — most commonly on Encore. 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.
Common Causes of P0146
- •Failed Bank 1 Sensor 3 O2 sensor
- •Open signal or ground circuit
- •Disconnected connector
- •Blown sensor heater
- •Exhaust leak affecting readings
P0146 on Buick by Model
Buick Encore(1 issue)
- EVAP Purge Pump Can Fail (Special Coverage N242484740)2022
GM Special Coverage N242484740 identifies certain 2022 Buick Encore vehicles whose evaporative-emissions purge pump can fail. The documented symptoms are a check-engine light and one or more purge-pump diagnostic trouble codes.
Looking for P0146 on a different make?
View P0146 across all makes →Frequently Asked Questions
What does P0146 mean on Buick?▼
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. On Buick specifically, this code is documented across 1 model.
What causes P0146 on Buick vehicles?▼
Common causes on Buick: Failed Bank 1 Sensor 3 O2 sensor, Open signal or ground circuit, Disconnected connector, Blown sensor heater, Exhaust leak affecting readings. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0146 on a Buick?▼
Repair costs vary widely depending on the root cause and specific Buick model.
Which Buick models have P0146 documented?▼
Au7o has documented P0146 on 1 Buick model: Encore.