Replacement Guide / Nissan / Altima / 2003
Replacement guide
2003 Nissan Altima
Owner-reported component and symptom data for this model year.
What are you trying to fix?
Replacement-related components reported for this vehicle
14 owner reports involving the catalytic converter
View replacement guide12 owner reports involving the radiator
View replacement guide11 owner reports involving the oxygen sensor
View replacement guide5 owner reports involving the throttle body
View replacement guide4 owner reports involving the fuel pump
View replacement guide3 owner reports involving the headlights
View replacement guide3 owner reports involving the power window regulator
View replacement guide3 owner reports involving the ignition coil
View replacement guide3 owner reports involving the head gasket
View replacement guide3 owner reports involving the timing chain
View replacement guide2 owner reports involving the heater core
View replacement guide2 owner reports involving the door latch
View replacement guide2 owner reports involving the water pump
View replacement guide1 owner report involving the starter
View replacement guide1 owner report involving the alternator
View replacement guide1 owner report involving the brake rotor
View replacement guide1 owner report involving the strut
View replacement guide1 owner report involving the brake lights
View replacement guide1 owner report involving the wiper motor
View replacement guide1 owner report involving the thermostat
View replacement guideBrowse by system
Starting / charging
- Starter — 1 owner report
- Alternator — 1 owner report
Fuel / engine
- Catalytic converter — 14 owner reports
- Oxygen Sensor — 11 owner reports
- Throttle Body — 5 owner reports
- Fuel pump — 4 owner reports
- Ignition Coil — 3 owner reports
- Head Gasket — 3 owner reports
- Timing Chain — 3 owner reports
Cooling / HVAC
- Radiator — 12 owner reports
- Heater core — 2 owner reports
- Water Pump — 2 owner reports
- Thermostat — 1 owner report
Lighting / visibility
- Headlights — 3 owner reports
- Brake lights — 1 owner report
- Wiper motor — 1 owner report
Body / access
- Power window regulator — 3 owner reports
- Door latch — 2 owner reports
About this data
Component evidence comes from structured complaint categories and reviewed component mentions in complaint summaries. Owner-situation evidence comes from reviewed symptom language in complaint summaries. Reports are signals, not diagnoses.
How to read the counts
Counts are distinct owner reports involving a canonical component. They are not a failure rate, probability, or share of vehicles sold. A complaint involving a component does not prove that component caused the problem. Parent NHTSA system buckets are not counted as the part itself.