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P2195 OBD-II Trouble Code: O2 Sensor Signal Stuck Lean Bank 1 Sensor 1

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P2195 trouble code definition

O2 Sensor Signal Stuck Lean Bank 1 Sensor 1

What the P2195 code means

P2195 is an OBD-II generic code for the engine control module (ECM) detecting the O2 sensor signal stuck lean for bank 1 sensor 1. The engine has tried to lean out a rich condition and failed.

What causes the P2195 code?

The engine control module is getting a signal from the bank 1 sensor 1 it is overly rich in that side of the engine and has tried to lean the mixture out to its limit causing the code to be set.

What are the symptoms of the P2195 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory as a fault.

  • The engine may be running rough, rich, and misfiring.

How does a mechanic diagnose the P2195 code?

  • Scans and documents the code in the ECM to check the freeze frame data for failure

  • Checks for any intake vacuum leaks or intake hose leaks between the mass air sensor and the throttle body

  • Checks for excessive fuel pressure

  • Checks the codes to see if only one or both sides of the engine are running rich

  • Checks the fuel injectors to see if one is leaking or stuck open

Common mistakes when diagnosing the P2195 code

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired

  • Failing to clear the ECM codes after the codes are fixed

  • Failing to check the air filter for damage, allowing air to enter the intake unmetered by the mass air sensor

How serious is the P2195 code?

Code P2195 is an indication that the ECM is getting a signal to go lean from the O2 sensor and has tried to lean out the mixture to its limit and the system is still too rich.

What repairs can fix the P2195 code?

Additional comments for consideration regarding the P2195 code

Code P2195 is for only one of the O2 sensors and may be accompanied with other O2 sensor codes if the problem is causing the entire engine to run rich like excessive fuel pressure or mass air sensor or tube problems.

Need help with a P2195 code?

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