Replacement Guide / Toyota / Corolla / 2003
Replacement guide
2003 Toyota Corolla
Owner-reported component and symptom data for this model year.
What are you trying to fix?
Replacement-related components reported for this vehicle
13 owner reports involving the catalytic converter
View replacement guide6 owner reports involving the headlights
View replacement guide4 owner reports involving the power window regulator
View replacement guide3 owner reports involving the egr valve
View replacement guide1 owner report involving the battery
View replacement guide1 owner report involving the brake rotor
View replacement guide1 owner report involving the master cylinder
View replacement guide1 owner report involving the door latch
View replacement guide1 owner report involving the oxygen sensor
View replacement guideBrowse by system
Fuel / engine
- Catalytic converter — 13 owner reports
- EGR valve — 3 owner reports
- Oxygen Sensor — 1 owner report
Brakes
- Brake rotor — 1 owner report
- Master cylinder — 1 owner report
Body / access
- Power window regulator — 4 owner reports
- Door latch — 1 owner report
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.