Code
P0133
Emissions
Sonde à oxygène — réponse lente — Rangée 1 Capteur 1
La sonde amont répond trop lentement.
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Most likely causes
- Sonde vieillissante
- Contamination
- Fuite d’échappement
Symptoms you may notice
- Check engine light
- Worse economy
Checks to run
- Watch O2 switching rate
- Test the sensor
- Check for leaks
Tools you may need
OBD-II scanner
Multimeter
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.