1999 Ford Focus 1.6 Fault Code P1131 Explanation
My 1999 Ford Focus 1.6 (VM) is showing fault code P1131. What does this code mean and how can I fix it?
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Related fault codes
P1131
Comments (2)
Anonymous
2017-11-13 10:15
P1131 = Lack of HO2S signal - Sensor indicates lean mixture. Given the vehicle's age, replacing the upstream oxygen sensor with a genuine dealer part is advised to resolve this issue effectively.
The fault code P1131 indicates a lack of upstream O2 sensor signal, suggesting the engine is running lean. For a 1999 Ford Focus 1.6, this typically points to a faulty upstream oxygen sensor. Replacing the upstream O2 sensor with one from an authorized dealer is recommended for reliable performance and emissions compliance.