Powertrain, generic (extended)

P2449 AIR System High Air Flow (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2449 is the bank 2 high-flow fault of the AIR system: during or after the air injection phase the second bank receives more air than predicted. Ford assigns it in its 2012 OBD summary to the bank 2 secondary air readiness, next to P0492 for too little flow, so the code belongs to Ford's AIR monitor even though no threshold is published. Likely causes mirror bank 1: a bank 2 shut-off or check valve that does not seal, a relay that keeps the pump running, or a lean signal that does not fit the model. Since excess air only leans out the mixture for a short time, drivers seldom notice anything beyond the warning lamp. The legal basis lies in CARB's AIR monitoring rules. P2448 is the bank 1 code, P0492 the low-flow partner.

Likely causes

Bank 2 shut-off valve does not seal
Pump keeps running due to a sticking relay
Check valve on bank 2 leaking

Symptoms

  • Check engine lamp
  • Usually no change in driving behaviour

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–800
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

secondary air switching valvesecondary air pumpair check valve

Related codes

P2448P0492P2442

References: newtonnet.co.uk, law.cornell.edu.