P2197 on Ford
O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 1)
P2197 on Ford vehicles indicates o2 sensor signal biased/stuck lean (bank 2, sensor 1). Au7o has documented this code across 1 Ford model — most commonly on Escape. 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. Typical repair costs on Ford range from $300 to $900, depending on the specific model and root cause.
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 Ford by Model
Ford Escape(1 issue)
- 3.0L Duratec Lower Intake Manifold Gasket Vacuum Leak — Both-Bank Lean Codes and Cold Rough Running2001-2012
The lower intake manifold gasket on the 3.0L Duratec V6 hardens and leaks, producing an unmetered air leak that affects both cylinder banks equally. The signature is P0171 and P0174 stored together — a lean condition on bank 1 and bank 2 at the same time — usually accompanied by P0300 random misfire. Because the leak is largest when the aluminum is cold and shrinks as the engine warms and the manifold expands, the classic complaint is an engine that runs badly and stumbles for the first several minutes, then smooths out. Fuel trims tell the story: long-term trim is pegged at maximum positive adaptation at cold idle but returns to near normal at part throttle. Owners chase MAF sensors, oxygen sensors and fuel pumps for months because the codes point at fueling. The both-banks-lean pattern is what rules the fuel side out and points at a shared vacuum leak upstream of both banks — the lower intake gasket, and secondarily the upper intake gasket or a cracked PCV/vacuum hose.
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View P2197 across all makes →Frequently Asked Questions
What does P2197 mean on Ford?▼
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 Ford specifically, this code is documented across 1 model.
What causes P2197 on Ford vehicles?▼
Common causes on Ford: 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 Ford?▼
Repair costs on Ford range from $300 to $900, depending on the specific model and root cause.
Which Ford models have P2197 documented?▼
Au7o has documented P2197 on 1 Ford model: Escape.