P24A3: Particulate Filter Restriction Soot Accumulation Bank 2

What it means

The DPF on bank 2 has accumulated soot beyond the normal operating window. Active regeneration will be requested.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The bank 2 DPF traps soot from that exhaust bank, while pressure and other sensor data help the controller estimate restriction and request regeneration. P24A3 indicates that bank 2 soot accumulation has exceeded its normal operating range, so the system may request active regeneration.

Common causes

Most likely first.

1. Excessive soot accumulation from incomplete regenerations
2. Frequent short trips or low-speed driving
3. Faulty differential-pressure or soot-load sensor
4. Restricted air intake or engine fault increasing soot

Symptoms

• Check engine light or DPF warning light on
• Power loss / limp mode
• Increased fuel consumption
• Failed forced regeneration attempts

How to diagnose it

1. Check freeze-frame data and live bank 2 soot-load and differential-pressure readings to confirm the restriction indication and compare with bank 1 if fitted.
2. Inspect bank 2 differential-pressure sensor hoses for blockage, cracking, disconnection, or condensate that could give a misleading reading.
3. Check bank 2 exhaust temperature sensor readings and inspect their wiring and connectors for damage.
4. Inspect the bank 2 DPF and nearby exhaust for leaks or physical damage that could affect pressure measurements.
5. Scan for engine faults or intake problems that could create excess soot, and check whether prior regenerations completed.
6. Use the manufacturer's procedure to assess whether soot loading is low enough for a safe regeneration before attempting one.

Common fixes

• Clear or replace a blocked, cracked, or disconnected bank 2 pressure-sensor hose.
• Repair damaged sensor wiring or connectors on bank 2.
• Replace a pressure or temperature sensor that fails testing against the manufacturer's specification.
• Correct the engine or intake fault causing excessive soot.
• Perform a service regeneration if the DPF condition and soot load allow it.

Can I keep driving?

Limit short, low-speed trips and address the warning soon; continued soot accumulation can restrict bank 2 exhaust flow and lead to reduced power. Do not force a regeneration if the vehicle or service procedure says the soot load is too high.