OBD Guide
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P1418

Secondary Air Injection System Relay 'A' Control Circuit High

P1418 is an OBD-II diagnostic trouble code meaning: Secondary Air Injection System Relay 'A' Control Circuit High. Common causes: short circuit to positive in the relay control circuit, faulty secondary air relay. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Check Engine Light Is On
  • Deterioration of engine performance when cold
  • Increased emissions
  • Possible misfires when warming up
  • Noise from the secondary air pump

Causes

  • Short circuit to positive in the relay control circuit
  • Faulty secondary air relay
  • Wiring harness damage
  • Problems with the engine control unit
  • Corrosion of contacts or connectors

How to Fix

  1. Check the integrity of the system wiring harness
  2. Test secondary air relay
  3. Check control circuit voltage
  4. Replace relay if necessary
  5. Clean or replace damaged connectors

Related codes

P0410P0418P2440

Error P1418 by Vehicle Brand

BuickCadillacChevroletChryslerGMGMCMazdaOldsmobilePlymouthPontiacSaturnVolkswagen

FAQ

What does the P1418 code mean?

P1418 is an OBD-II diagnostic trouble code that indicates: Secondary Air Injection System Relay 'A' Control Circuit High

What causes a P1418 error code?

The most common causes of P1418 include: Short circuit to positive in the relay control circuit; Faulty secondary air relay; Wiring harness damage; Problems with the engine control unit.

How do I fix a P1418 diagnostic trouble code?

To fix P1418: Check the integrity of the system wiring harness. Test secondary air relay. Check control circuit voltage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1418?

Yes, but get it checked soon

How much does it cost to fix P1418?

The estimated repair cost for P1418 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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