BOSCH 4203
BOSCH part number 4203 is a spark plug in the Ignition system. This catalog matches it to 111 year-and-engine configurations from 2006 to 2026.
Verified fitment includes 2026 Chevrolet Express 4500 6.6L V8 ; 2025 Chevrolet Express 2500 4.3L V6 ; 2025 Chevrolet Express 2500 6.6L V8 ; 2025 Chevrolet Express 3500 4.3L V6 ; 2025 Chevrolet Express 3500 6.6L V8 , plus 106 other configurations. See every vehicle this part fits.
Frequently Asked Questions
What is BOSCH 4203?
BOSCH part number 4203 is a spark plug with published application data for 111 vehicle configurations from 2006 to 2026. Use the manufacturer part number to cross-reference your old part or a repair quote before you order.
Which vehicles does BOSCH 4203 fit?
This catalog matches 4203 to 111 year-and-engine configurations from 2006 to 2026. Open the compatible-vehicles list for every make, model and engine, and read the notes for position or trim qualifiers.
Is BOSCH 4203 OEM or aftermarket?
What matters is the published application data for this part number, not the label on the box. BOSCH 4203 is listed with its manufacturer part number so you can compare it to an OEM number or another brand that covers the same fitment.
AutoFactsDB is reader-supported. As an Amazon Associate, we earn from qualifying purchases made through links on this page — at no extra cost to you.
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.