P2441moderate severityPowertrain
Secondary Air Injection System Switching Valve Stuck Closed Bank 1
on 1996 Lexus LS 400 4.0L V8 · RWD
What this code means
The secondary air switching valve bank 1 is stuck closed, preventing air injection.
Symptoms
- Check engine light
- High emissions at cold start
- Slow catalyst warm-up
Common causes
- Corroded/stuck valve
- No vacuum to valve
- Carbon buildup
Diagnostic steps
- Check vacuum supply to valve
- Inspect valve mechanism
- Verify air pump operation
Repair notes
Replace valve or repair vacuum supply.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1