How much does it cost to fix P2197?

DIY repair typically costs $25–$100 for parts. Professional repair runs $100–$350 including parts and labor.

P2197

Powertrain

Low

O2 Sensor Signal Biased/Stuck Lean - Bank 2 Sensor 1

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Code P2197 is the Bank 2 counterpart to P2195, indicating that the upstream oxygen sensor on Bank 2 is consistently reading lean or stuck on a lean-biased signal. On V-type and horizontally-opposed engines, Bank 2 is typically the cylinder bank that does not contain cylinder #1. This code tells you the issue is specific to the Bank 2 side of the engine.

The bank-specific nature of this code is diagnostically valuable. If only P2197 is set (without P2195), the problem is likely isolated to the Bank 2 side — perhaps a vacuum leak in the intake runner for Bank 2 cylinders, an exhaust leak near the Bank 2 sensor, or a failing O2 sensor on that side. If both P2195 and P2197 are present, the problem is more likely something common to both banks, such as fuel pressure or a contaminated MAF sensor.

Diagnosis and repair follow the same approach as P2195. Use a scan tool to monitor the Bank 2 upstream O2 sensor voltage and fuel trim data. If the sensor isn't oscillating properly, replace it. If the engine is genuinely lean on Bank 2 (positive fuel trims), investigate vacuum leaks and fuel delivery on that side. O2 sensors are routine maintenance items and replacing one is a manageable DIY project with an O2 sensor socket and basic hand tools.

Severity

Moderate — Address SoonThis Month

Symptoms

•Reduced fuel economy
•Rough running or hesitation
•Check Engine Light on
•Possible rough idle
•May fail emissions inspection

Likely Causes

Faulty upstream oxygen sensor (Bank 2)35%

The Bank 2 upstream O2 sensor has degraded or become contaminated, causing it to remain biased toward lean voltage readings rather than oscillating normally between rich and lean.

Vacuum leak on the Bank 2 side25%

An intake leak specific to the Bank 2 cylinders causes a genuine lean condition on that bank, which the O2 sensor accurately reports. The PCM may interpret the persistent lean signal as a stuck sensor.

Exhaust leak near the Bank 2 sensor20%

A leak in the exhaust manifold or pipe on the Bank 2 side allows outside air to dilute the exhaust gases at the sensor location, making it read lean regardless of actual combustion mixture.

Fuel delivery problem affecting Bank 220%

Clogged fuel injectors, a restricted fuel line, or low fuel pressure affecting the Bank 2 cylinders creates an actual lean condition detected by the sensor.