📖 What Does P0140 Mean?
The downstream oxygen sensor on bank 1 shows no switching activity.
Symptoms
Failed emissions test, check engine light, catalytic converter monitoring disabled.
Common Causes
Failed oxygen sensor, open wiring circuit, no power to sensor, completely contaminated sensor.
Possible Solutions
Replace oxygen sensor, repair open circuits, check power supply, inspect for contamination.
Recommended Parts & Tools
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📦 Parts Needed
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Frequently Asked Questions about P0140
How serious is P0140?
This code has a medium severity level. This should be diagnosed and repaired soon to prevent further issues.
Can I drive with P0140?
You can typically drive short distances, but have it diagnosed as soon as possible.
How much does it cost to fix P0140?
Repair costs vary depending on the root cause, but typically range from $100-300 including parts and labor.
Related Diagnostic Codes
Other codes that may appear with P0140
Fuel and Air Metering Code P0100
Mass Air Flow Sensor Circuit Range/Performance Problem
Mass Air Flow Sensor Circuit Low Input
Mass Air Flow Sensor Circuit High Input
Fuel and Air Metering Code P0104
Fuel and Air Metering Code P0105
💡 Why These Codes Are Related:
- • Similar Issues: Same root cause or component failure
- • Related Problems: Often occur together due to system interactions
- • Sequential Codes: Progressive failure stages or multiple sensors
- • Same System: Components within the same automotive system