P2197: O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 1)
3 vehicles · 2 makes · $220-$900 repair
Most Reported On
P2197 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2007-2010 Toyota Camry, 2001-2012 Ford Escape, and 2008-2013 Toyota Highlander, with repair costs ranging from $220 to $900.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a powertrain code, so a basic OBD-II reader can read it. These read P2197.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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Vehicles Affected (3)
FAQ
What does P2197 mean?
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.
What are the most common causes of P2197?
The most common causes of P2197 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P2197?
Repair costs for P2197 range from $220 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P2197?
Au7o has documented P2197 across 3 vehicle models from 2 manufacturers: Ford, Toyota.
Sources (7)
- TSBToyota T-SB-0001-10 Rev1: P0138, P0158 and/or P0606 Diagnostic Tips
- ForumAnother case of P0171/P0174... — Ford Escape Automobiles Forum (escape-city.com)
- Forum2001 6cyl Escape P0171 & P0174 Codes — Ford Truck Enthusiasts Forums
- ForumRough idle, no power, P0174 and P2197 — escape-city.com
- ForumToyotaNation (Highlander 2nd Gen 2008-2013): A/F Sensor Issue? (P2197)
- ForumToyotaNation: CHECK ENGINE LIGHT code P2195, air fuel sensor B1S1 bad
- TSBCorrecting Toyota Air Fuel Response — Toyota service bulletin coverage for 2008-2010 Highlander P0138/P0158 with P2195/P2197
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.