What causes a P0412 code?

Common causes: Stuck switching valve; Wiring.

Is it safe to drive with a P0412 code?

Yes — this code is generally safe to drive with, but address it soon to avoid escalation. Estimated repair: $150-$500.

OBD-II Code · Emissions

Secondary Air Injection Switching Valve

low severitySafe to drive$150-$500

Air injection switching valve fault.

Common symptoms

Likely causes

Where to start

Try the cheapest cause first. Start by checking: stuck switching valve.
Cost & scope. $150-$500
If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.

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