What causes a P0418 code?

Common causes: Failed secondary air pump; Stuck/seized pump; Wiring/relay.

What are the symptoms of a P0418 code?

Typical symptoms: CEL; Possible emissions failure; No driveability impact.

Yes — this code is generally safe to drive with, but address it soon to avoid escalation. Estimated repair: $200-$1,200.

OBD-II Code · Powertrain

Secondary Air Injection Pump "A" Circuit

low severitySafe to drive$200-$1,200

Fault in the secondary air injection pump circuit (used during cold starts to cut emissions).

Common symptoms

Likely causes

Where to start

Try the cheapest cause first. Start by checking: failed secondary air pump.
Cost & scope. $200-$1,200
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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