Secondary Air Injection Pump Relay Circuit
1990-2002 Mercedes-Benz SL 3.0L I6
Description
The ECU detected a malfunction in the secondary air injection pump relay circuit. The relay cannot be properly controlled, preventing the air pump from operating during cold starts.
Symptoms
- Check Engine Light
- Failed emissions test
- No air pump sound on cold start
Common Causes
- Faulty air pump relay
- Relay connector corrosion
- Wiring fault to relay
- ECU relay driver failure
- Blown relay fuse
Diagnostic Steps
- Test relay operation with multimeter
- Check relay fuse
- Inspect connector for corrosion
- Test ECU relay driver output
- Swap relay with known-good unit
Repair Notes
Replace the secondary air injection pump relay.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1453 on Other Vehicles
Mercedes-Benz 500SL R129
1990-2002 5.0L V8 M119
Mercedes-Benz 600SL R129
1993-2002 6.0L V12 M120
Mercedes-Benz A220 W177
2019-2024 2.0L I4 Turbo M260
Mercedes-Benz A250 W176
2013-2018 2.0L I4 Turbo M270
Mercedes-Benz A35 AMG W177
2020-2024 2.0L I4 Turbo M260
Mercedes-Benz A45 AMG W176
2014-2018 2.0L I4 Turbo M133
Mercedes-Benz A45 AMG W177
2020-2024 2.0L I4 Turbo M139
Mercedes-Benz AMG GT
2015-2024 4.0L Turbo V8
Common Questions
What does code P1453 mean on a 1990-2002 Mercedes-Benz SL?
P1453 stands for "Secondary Air Injection Pump Relay Circuit". The ECU detected a malfunction in the secondary air injection pump relay circuit. The relay cannot be properly controlled, preventing the air pump from operating during cold starts.
What are the symptoms of P1453 on a Mercedes-Benz SL?
Common symptoms of P1453 include: Check Engine Light, Failed emissions test, No air pump sound on cold start.
What causes P1453 on a 1990-2002 Mercedes-Benz SL?
Common causes of P1453 include: Faulty air pump relay, Relay connector corrosion, Wiring fault to relay, ECU relay driver failure, Blown relay fuse.