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DTC codes / Chrysler codes / P1476

P1476 · ChryslerToo Little Secondary Air

P1476 on Chrysler vehicles means the powertrain control module (PCM) commanded the secondary air injection system to run and did not see the expected change in oxygen sensor feedback, indicating too little air is being delivered. The PCM typically detects this by monitoring the upstream oxygen sensor response during the air pump test and flagging the code when the sensor signal does not lean out as expected.

SystemPowertrain
Code typeChrysler specific
SeverityLow
Fix difficultyIntermediate
AreaAuxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Slight rough idle or stumble during the first minute or two after a cold start
  • A brief rich exhaust smell at startup because extra fuel is being added without enough air
  • Occasional hesitation when accelerating from a stop while the engine is still cold
  • Failed emissions test due to incomplete or failed secondary air monitor
  • In rare cases, a whistling or rushing noise from a disconnected air hose

Common causes, most likely first

  1. Failed secondary air injection pump (electric blower motor seized or worn out)
  2. Broken, cracked, or disconnected air injection hose or tubing between the pump and the exhaust
  3. Failed secondary air injection solenoid or combi valve that is stuck closed
  4. Blown fuse or corroded relay in the secondary air pump circuit
  5. Clogged or carbon-fouled air injection passages inside the cylinder head or exhaust manifold
  6. Failed upstream oxygen sensor that is slow to respond, causing the PCM to misjudge the air delivery
  7. Damaged wiring or poor ground connection at the secondary air pump or solenoid

How to diagnose and fix it

  1. Inspect all secondary air hoses and tubing for cracks, disconnects, or melted sections and repair as needed
  2. Check the secondary air pump fuse and relay, then test the pump directly with 12 volts to confirm it runs
  3. Command the secondary air pump on with a scan tool and listen for operation while watching upstream oxygen sensor voltage for a lean shift
  4. Test the secondary air solenoid or combi valve for proper vacuum operation and free movement
  5. Check for carbon blockage in the air injection passages at the cylinder head or exhaust manifold
  6. Verify the upstream oxygen sensor responds quickly to a known lean condition before condemning the air system
  7. Clear the code and run the secondary air monitor to confirm the repair

What P1476 really tells you about the air pump

  • A missing or disconnected air hose at the combi valve is one of the most common causes and is often overlooked because the pump still runs quietly.
  • The PCM may set P1476 even when the air pump works perfectly if the upstream oxygen sensor is lazy and does not react to the extra air.
  • Carbon buildup in the air injection passages can restrict flow enough to trigger the code without any visible hose damage.
  • A weak battery or poor ground can cause the secondary air pump to run too slowly, delivering too little air and setting the code.
  • Do not replace the catalytic converter for P1476; the code is about air delivery, not converter efficiency.

Can I keep driving with P1476?

You can generally keep driving with P1476 because the fault only affects cold-start emissions and does not cause a safety risk. Avoid long periods of idling from a cold start and get the system checked before your next emissions test.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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