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This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


DTC 2195: O2 Sensor Signal Stuck Lean Bank 1 Sensor 1


The oxygen sensors in bank 1 use voltage signals to convey the air-fuel ratio to the car engine’s control module, the ECM. When the air-fuel ratio deviates from the ideal rate of 14.7:1, the oxygen sensor located in bank1 sends out voltage signals to the car engine’s control module. The ECM detects that the engine has made an attempt to regulate the air-fuel ratio by leaning out the thick condition but has failed. On the failure of this attempt to eradicate the thickness of the air-fuel ratio, the DTC 2195 appears.


There can be multiple reasons for the appearance of DTC 2195. Some of them are listed below:

  1. A malfunction in the Bank1 oxygen O2 sensor1
  2. Faulty wiring in the Bank 1 oxygen sensor1- a short or frayed circuit of the oxygen sensor
  3. A malfunction in the fuel injector causing the air-fuel ratio to deviate from the normal range
  4. A low fuel pressure
  5. A leakage in the exhaust chamber 
  6. Junk in the airflow sensor


The following symptom may be experienced due to DTC 2195:

  • An illuminated ‘check engine light.’
  • Low engine power may be experienced.
  • The engine may overheat frequently.
  • The engine performance may display roughness.
  • Engine misfiring or jerking.
  • The engine may be running rich.


Self Diagnosis:

  • Visually inspect the bank1 oxygen sensor1 for any damaged or frayed cables and connections
  • Visually inspect the mass airflow sensor if it requires to be cleaned or serviced
  • Ensure that the airflow filter is in place
  • Ensure that the airflow filter is not damaged and does not allow any debris to pass through
  • Check vacuum lines for cracks or damage
  • If your car has more than one bank, then you can switch to the other bank and clear the ECM code to see if the code reappears on the other bank or not. In case the code does not reappear, it would verify that the problem lies with the oxygen sensor1. Doing so can save you the money required for a professional service
  • It is always advised to arrange for safety measures such as a fire extinguisher and wearing gloves in order to avoid accidents from causing any physical damage

Professional Diagnosis:

Replacement of the bank1 oxygen sensor should be considered as the last resort. Prior to replacing the oxygen sensor, it is advised to have the engine professionally examined by a technician or mechanic. The mechanic would possibly follow the below-mentioned steps:

  • Begin with scanning the ECM for pinpointing the exact fault code experienced. It is also important for the technician to monitor the freeze frame data in order to determine the conditions at the time when the code was set. Scanning tools that can be used to scan the ECM include TOAD-Total Auto Diagnostics app, Innova 3160g, Bluedriver Bluetooth etc. 
  • Examine if there are any vacuum leaks or any leaks in the intake hose, which is located between the mass airflow sensor and the throttle body. In case of a leak, replace the vacuum lines or the intake air tube. It is also advised to replace all vacuum tubes if a faulty tube is located as vacuum tubes tend to wear off and crack over time. 
  • Check the fuel pressure if it exceeds or is less than the normal range- A fuel pump or a fuel pressure regulator may need to be installed in order to align the readings with the manufacturer’s specified range.
  • Check the fuel injectors for leaks and repair or replace, as per the requirements of the situation.
  • Check if one or both sides of the engine are experiencing a thick air-fuel ratio. This would help in fool-proofing the fix prior to clearing the ECM code. 
  • With the help of a voltmeter, check if the mass airflow sensor is properly functioning. If the readings do not coincide with those specified by the manufacturer, then a replacement of the mass airflow sensor may be required. 

Common mistakes

Premature replacement of the bank1 oxygen sensor1 without ruling out the possibility of leakages and broken wiring in the various components of the exhaust flow system is one the most commonly made mistakes when it comes to the diagnosis of DTC 2195. 

The mechanic may also clear the ECM memory for fault codes without first checking the freeze frame data, which helps in quickly determining if the airflow sensor is working properly, even without having to examine the sensor itself. Ignoring the freeze frame data could hence lead to a delayed diagnosis. It may also be the case that the mechanic forgets to clear the ECM for fault codes even after fixing the damaged component.

Mechanics may also miss out on checking the airflow filter for leakages or damage. This may cause the DTC 2195 to reappear. 

How dangerous is DTC 2195?

Running your car without having the DTC 2195 fixed can lead to fuel dumping and eventual engine breakdown. A timely fix of the DTC 2195 can help save money, time and energy and can help prevent long term damage.

How to fix this?

The DTC 2195 can be fixed by taking different measures such as replacing the O2 sensor, replacing faulty wiring, replacing the fuel pressure regulator, replacing the damaged tubes and connectors or cleaning the mass airflow sensor of any debris. 

In addition to all of the above, regular follow-up and visits for having the car’s engine serviced and cleaned can help maintain the health of the engine and can help avoid DTC 2195 from appearing.

Related codes



P2195 can also result in the occurrence of other related fault codes that are linked with the richness in the air-fuel ratio. It is advised to ensure regular car maintenance and servicing to avoid P2195 as regular monitoring of the engine would help in timely detecting any leakages or damages, hence, helping in avoiding the occurrence of the DTC 2195.