P0139 P0139 OBD-II: O2 Sensor Circuit Slow Response
What P0139 means for you
This code indicates a moderate issue with the oxygen sensor circuit that can affect emissions and fuel efficiency.
Symptoms
- The Check Engine Light may turn on.
- Often, drivers may not notice any unusual symptoms.
- The vehicle might not pass an emissions test.
- In some instances, the engine could produce a 'ping' sound and emit higher levels of NOx.
Common causes
- The oxygen sensor's role is to assess the oxygen levels in the exhaust gases after combustion. This data is essential for the Powertrain Control Module (PCM) to optimize fuel efficiency.
- If the PCM identifies a malfunction in the sensor or the data it receives, it triggers code P0139.
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Send your ECUWhat this code means
Code P0139 signifies that the oxygen sensor circuit is responding slowly, which can hinder the engine's performance and fuel economy.
Frequently asked questions
It is not advisable to continue driving with a P0139 code, as it can lead to increased emissions and potential engine performance issues.
The repair cost for a P0139 code typically ranges from $100 to $300, depending on whether the oxygen sensor needs replacement or if there are other underlying issues.
Ignoring the P0139 code can result in poor fuel economy, increased emissions, and potential failure of emissions testing.
