P04xx OBD2 codes — causes & fixes

All P04xx diagnostic trouble codes (171 published): short meanings and links to full articles. Canonical URLs /dtc/P04XX/.

• P0490
• P0491
• P0492
• P0493
• P0494
• P0495
• P0496
• P0497
• P0498
• P0499
• P049A
• P049B
• P049C
• P049D
• P049E
• P049F
• P04A0
• P04A1
• P04A2
• P04A3
• P04A4
• P04A5
• P04A6
• P04A7
• P04A8
• P04A9
• P04AA