P2197 on Toyota
O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 1)
P2197 on Toyota vehicles indicates o2 sensor signal biased/stuck lean (bank 2, sensor 1). Au7o has documented this code across 1 Toyota model — most commonly on Camry. The PCM detected that the upstream (sensor 1) oxygen/air-fuel sensor on bank 2 is stuck reporting a lean signal and is not responding to mixture changes. The bank 2 sensor signal is biased lean and unresponsive.
Common Causes of P2197
- •Failed/aged upstream O2 (A/F) sensor bank 2
- •Exhaust leak near bank 2 sensor
- •Actual lean condition (vacuum leak, low fuel pressure)
- •Contaminated sensor
- •Sensor wiring/connector fault
P2197 on Toyota by Model
Toyota Camry(1 issue)
- 2007-2010 2GR-FE P0138/P0158/P0606 Diagnostic Gates - T-SB-0001-102007-2010
Toyota T-SB-0001-10 Rev1 covers specified 2007-2009 Camry VDS BK46K and 2010 VDS BK3EK applications. P0138/P0158 may result from incorrect air-fuel-sensor response, and P0606 may also be present due to incorrect downstream O2-sensor operation. Toyota distinguishes these paths using the complete DTC set, freeze-frame air-fuel/O2 voltage and downstream O2 impedance, followed by circuit inspection. It does not describe every P0606 as a sensor fault or support the original 2AZ-FE, 2006-2012, VSC/TRAC or battery claims.
Looking for P2197 on a different make?
View P2197 across all makes →Frequently Asked Questions
What does P2197 mean on Toyota?▼
P2197 stands for "O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 1)." The PCM detected that the upstream (sensor 1) oxygen/air-fuel sensor on bank 2 is stuck reporting a lean signal and is not responding to mixture changes. The bank 2 sensor signal is biased lean and unresponsive. On Toyota specifically, this code is documented across 1 model.
What causes P2197 on Toyota vehicles?▼
Common causes on Toyota: Failed/aged upstream O2 (A/F) sensor bank 2, Exhaust leak near bank 2 sensor, Actual lean condition (vacuum leak, low fuel pressure), Contaminated sensor, Sensor wiring/connector fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2197 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have P2197 documented?▼
Au7o has documented P2197 on 1 Toyota model: Camry.