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




P2195 is a generic OBD-II code that stands for O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 and is set when the engine control module (ECM) detects a stuck lean O2 sensor signal for bank 1 sensor 1. The engine has unsuccessfully attempted to lean out of a rich condition.

In this article, I will be talking about P2195, its symptoms, causes, and how to fix it.

What Does The P2195 Code Mean?

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

The code P2195 is an emissions-related code, and more specifically, it indicates that one of the oxygen sensors (bank 1, sensor 1) has detected a lean circuit.

A lean circuit indicates that there is insufficient fuel in the system; the oxygen sensor circuit can indicate this by measuring the number of exhaust emissions.

It recognizes that your vehicle did not magically become better at reducing emissions, which indicates that there is insufficient fuel in the combustion chamber.

However, code P2195 indicates more than simply a lean circuit; it indicates that the circuit is stuck lean. This means that the engine has tried adding more fuel to adjust to the circuit, but without success.

(See also: P0300 OBD-II Random/Multiple Cylinder Misfire Detected Trouble Code)

Which Models Are Affected By The P2195 Code

MakeAffected By P2195 Code

What Are The Possible Causes of the P2195 Code?

The P2195 trouble code is caused when the O2 bank 1 sensor 1 has a lean circuit. As a result, there is less fuel in the combustion chamber and the vehicle’s computer is able to pick up this information and cause the P2195 to appear.

Below is a list of the most possible causes the engine code P2195 registers in your vehicle’s ECU:

  • Bad oxygen sensor
  • Malfunctioning fuel injector
  • Vacuum leaks
  • Fuel pressure too low
  • Debris in Mass Airflow Sensor
  • Exhaust leak
  • Faulty PCM (powertrain control module)
  • Connectors are damaged
  • Defective A/F sensor relay

What Are The Common Symptoms of The P2195 Code?

Check Engine Light is the most obvious symptom of the P2195 code. However, it can also cause performance issues, which vary depending on the underlying cause.

Common symptoms of the P2195 code include:

  • Low engine power
  • Poor engine performance
  • Illuminated check engine warning light
  • Overheating engine
  • Engine running rough
  • The engine doesn’t work well or it is jerking
  • Poor fuel economy

Is It Safe To Drive With a P2195 Code

Yes, it is safe to drive with a P2195 code. Typically, this diagnostic code will not prevent your car from functioning, but it is imperative that you address it as soon as possible.

The longer you drive your car with these issues, the more likely it is that you may incur damage that will be substantially more expensive to repair.

The mixture of fuel and air is what allows your engine to perform properly, and while the car may be able to continue running initially, this issue can cause internal engine damage, which can be extremely costly and difficult to repair.

(See also: P0171 OBD-II System Too Lean (Bank 1) Trouble Code)

How To Diagnose The P2195 Code

To determine the cause of the P2195 error, you must diagnose the system as an expert would. You can follow the instructions in your vehicle’s service handbook for precise parameters and to determine the optimal operating temperature for your vehicle.

In the following you can learn how to diagnose the P2195 code:

  1. Employ an OBD-II scanner to locate the code.
  2. Record all fault codes along with freeze frame data. Clear any error codes and perform a test drive. If the code is returned, proceed with further inspection.
  3. Between the throttle body and the MAF sensor, check for an intake vacuum leak or intake hose leak.
  4. Check for increased fuel pressure. If the pressure is below the minimum threshold, you must replace the fuel pump or fuel pressure regulator.
  5. Investigate if there are exhaust leaks.
  6. Examine the wires that are connected to the affected O2 sensor for corrosion or damage.
  7. Inspect the MAF sensor to determine if it needs to be cleaned; clean as necessary.
  8. You should replace any vacuum lines or intake air tubes with cracks or damage.
  9. Examine the O2 sensor for any defects or contaminants. Replace your O2 sensor if it is damaged.

This code may be more difficult to diagnose than it initially appears. It is crucial that the technical specialist verify that the fuel-to-air ratio is indeed incorrect, and then proceed with the necessary repairs based on the outcome. First, it must be determined whether the fuel-to-air ratio or the sensors are malfunctioning.

(See also: P0456 OBD-II Evaporative Emissions System Small Leak Detected Trouble Code)

Most Common Mistakes When Diagnosing The P2195 Code

Here are the most common mistakes when diagnosing the P2195 code:

  • Clearing ECM memory codes prior to examining the freeze frame data for the primary failure problem in order to duplicate and correct the failure.
  • Failure to clear the ECM codes after repairing the codes.
  • Failure to inspect the air filter for damage, allowing air to enter the intake without the mass air sensor measuring it.

How Much Does It Cost To Repair P2195 Code

MakeP2195 CodeRepair Cost
ToyotaYes$20 – $70
NissanYes$20 – $70
ChevroletYes$20 – $70
BMWYes$20 – $70
AudiYes$20 – $70
BuickYes$20 – $70
MercedesYes$20 – $70
GMCYes$20 – $70
SuzukiYes$20 – $70
TataYes$20 – $70
LexusYes$20 – $70
MazdaYes$20 – $70
MitsubishiYes$20 – $70
KiaYes$20 – $70
JeepYes$20 – $70
FiatYes$20 – $70
HondaYes$20 – $70
HyundaiYes$20 – $70
OpelYes$20 – $70
FordYes$20 – $70
FiatYes$20 – $70
PeugeotYes$20 – $70

What Repairs Can Fix The P2195 Code

After completing all of the procedures to diagnose the P2195 error code, you’ll have a greater understanding of the system’s malfunction. It is essential that you not undertake any repairs until you have determined the specific cause.

Repairs that can fix the P2195 code include:

  • Repair or replacement of the oxygen sensor
  • Wires that are frayed, faulty, or damaged must be replaced or repaired
  • Repair or replacement of the fuel pressure regulator
  • Replacement or maintenance of the MAF sensor
  • Replace or repair the injector that is leaking
  • Repair the exhaust leaks
  • Repair the vacuum leaks
  • Programming the PCM (powertrain control module) again

How To Fix The P2195 Code

To fix the P2195 code you need to:

  • Replace the O2 sensor
  • Replace the fuel pressure regulator
  • Replace a leaking injector
  • Replace a cracked intake air tube
  • If contaminated, clean or replace the mass airflow sensor.

In Conclusion

As I said earlier, P2195 is a generic OBD-II code that is set when the engine control module (ECM) detects a stuck lean 02 sensor signal for bank 1 sensor 1.

The P2195 is a relatively minor error. It does not prevent your vehicle from working. With this code, however, you may experience poor engine performance and poor fuel economy.

However, ignoring this code can cause internal engine damage and damage to other components, including the O2 sensor and catalytic converter.



Vide Polowenski, Senior Mechanic

The information in this article is current and up-to-date in accordance with the latest mechanic SOPs.

Please take the time to leave a comment if this article has helped you in any way, you need additional help, or you have a suggestion.

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