CARWATCH
P0121 Error on Peugeot
What it means and how to fix it
🚨 Fault Description (P0121)
The DTC code P0121 in a Peugeot vehicle is a sign that the onboard computer has registered the following anomaly:
"Throttle Position Sensor/Switch A Circuit Range/Performance Problem"
Although this is a standardized OBD2 code, the symptoms and the location of the faulty sensor can vary depending on the exact model of your Peugeot (year, engine type, etc).
Other frequent faults detected in Peugeot:
Get an Exact AI Diagnosis for your Peugeot
Instead of changing parts blindly, use the CarWatch AI assistant. Scan your Peugeot's sensors in real-time and find out the root cause of the P0121 fault before going to the shop.
👉 Diagnose my Peugeot for FreeRecommended OBD2 Scanner for Peugeot
To clear the engine light and read the P0121 code from your phone, you need an OBD2 adapter compatible with the Peugeot ECU.
🛒 View Compatible Scanner on Amazon