P0492

AIR System Insufficient Flow Bank 2

Q: Is it safe to drive with P0492?

Yes. Secondary air injection only runs briefly at cold start to warm the catalyst — a fault here doesn't stop the engine starting or running. It will fail emissions until fixed.

Q: Can I just clear P0492?

It comes back after the next cold-start monitor unless the pump, valve, or hose fault on bank 2 is actually repaired.

Secondary air injection / emissions Generic OBD-II High

What it means

P0492 means the secondary air injection system isn't pushing enough air into the bank 2 exhaust during cold start-up. This system briefly injects air to heat the catalytic converter faster and cut cold-start emissions; a fault here fails the emissions monitor but does not stop the engine from starting or running.

High

Can I keep driving? Yes — this is a cold-start emissions fault; the car starts and drives normally, but it will fail an emissions test until repaired.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Failed emissions test
Possible brief rough running just after a cold start
Air-pump noise absent or abnormal at start-up

Common causes

Most likely first

Damaged or failed secondary air (AIR) pumpLikely
Clogged, disconnected, or damaged air hoses to bank 2Common
Faulty AIR control or bypass valve on bank 2Common
Blocked air passages from carbon or moisture/corrosionLess often
Failed AIR system relay or wiringLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and confirm the air pump runs at cold start; check for a blown fuse or bad relay if it's silent.
Inspect the bank 2 air hoses, check valve, and passages for blockage, disconnection, or corrosion.
Test the AIR control/bypass valve operation and the pump's actual airflow.
Repair or replace the failed component (pump, valve, hose, or relay), then clear and re-test on a cold start.

FAQ

Quick answers

Is it safe to drive with P0492?+

Yes. Secondary air injection only runs briefly at cold start to warm the catalyst — a fault here doesn't stop the engine starting or running. It will fail emissions until fixed.

Can I just clear P0492?+

It comes back after the next cold-start monitor unless the pump, valve, or hose fault on bank 2 is actually repaired.

Read & clear P0492 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX