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DTC P0140

19.12.2024
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P0140
Vehicle engine and/or automatic transmission
Code: P0140 - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2

The Check Engine Light (CEL) or Malfunction Indicator Light (MIL) will be on. You’re unlikely to experience any noticeable driving issues, except for the MIL. This is because the downstream or post-catalytic oxygen sensor does not affect fuel delivery (this is an exception for Chrysler vehicles). It simply monitors the effectiveness of the catalyst. Therefore, you may not notice any engine problems.

The given OBD code is common for many car brands, including Renault, Kia, Skoda, Hyundai, Volkswagen, Ford, Mercedes-Benz, BMW, Nissan, Toyota, and others.

Causes of OBD P0140

When the oxygen sensor stops producing voltage or goes beyond the voltage limits, the computer detects the issue. In most vehicles, the downstream oxygen sensor serves only as a monitor for the catalyst's efficiency and does not affect fuel control. When the catalyst is working properly, the oxygen in the exhaust gases measured by this sensor should produce a steady voltage on the rich side of the scale, indicating that the catalyst is using oxygen in the chemical process.

Symptoms of P0140 Error

The causes of the P0140 code are limited and may include:

  • Overheated heating element in the oxygen sensor;
  • Overheated signal element in the oxygen sensor;
  • Melting of the connector or wiring due to contact with the exhaust system;
  • Moisture in the wiring connector or EEPROM (programmable flash memory reader that stores the vehicle’s engine control software);
  • Also, a faulty EEPROM.
dtc p0140

How to Fix the P0140 Code

To resolve the P0140 error, follow these steps:

  • Inspect the oxygen sensor for any visible damage. If the sensor is faulty, replace it with a new one. This is often the most straightforward solution.
  • Check the wiring and connectors for signs of damage, melting, or wear. If any of the wiring or connectors are compromised, repair or replace them as necessary.
  • Examine the exhaust system for any leaks that might affect the sensor’s readings. If leaks are present, fix them promptly.
  • If moisture is detected in the wiring or EEPROM, dry out the connections and replace any corroded parts.
  • If the issue is related to the vehicle's control module or software, consult the manufacturer’s service recommendations for potential updates or repairs to the ECU (Engine Control Unit).

Conclusion

If the P2196 code is detected, it is recommended to visit a service specialist for further diagnosis and to address the issue. They will help identify and resolve the causes of this malfunction.

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OBD P0140 code analysis and solutions

The page presents a detailed analysis of code P0140 for Opel, Renault, VW (Volkswagen), Ford, Peugeot, Mitsubishi, Skoda, BMW, Citroën, Toyota, Lada, Honda, Kia, and other models to investigate potential factors and solutions related to OBD2 errors, with focus on the issue. We provide engineering documentation and approaches for diagnostics to identify and resolve the issue effectively. Our goal is to become a complete resource offering information on issues related to obd 2 errors and to provide you with the tools needed for successful repair and maintenance of your auto. If during the fixing of OBD 2 codes you need to purchase parts, don’t forget to visit Avtopro!