CARWATCH
P0400 Error on Nissan
What it means and how to fix it
🚨 Fault Description (P0400)
The DTC code P0400 in a Nissan vehicle is a sign that the onboard computer has registered the following anomaly:
"Crankshaft Position Sensor B Circuit Intermittent"
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 Nissan (year, engine type, etc).
Other frequent faults detected in Nissan:
Get an Exact AI Diagnosis for your Nissan
Instead of changing parts blindly, use the CarWatch AI assistant. Scan your Nissan's sensors in real-time and find out the root cause of the P0400 fault before going to the shop.
👉 Diagnose my Nissan for FreeRecommended OBD2 Scanner for Nissan
To clear the engine light and read the P0400 code from your phone, you need an OBD2 adapter compatible with the Nissan ECU.
🛒 View Compatible Scanner on Amazon