Skip to product information
SKU:
NLT2S00215
Ships for free in 2–4 business days.
Air Injection Check Valve 0021407460 for Mercedes CLS550 SLK350 E350 S550 05-15
$208.59
In Stock
$208.59
Sale price
$208.59
Regular price
This secondary air-injection check valve replaces part number #0021407460 on select Mercedes-Benz gasoline engines. It keeps hot exhaust gases from flowing backward into the secondary-air supply.
Estimated delivery between
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- Mercedes-Benz C230/C280/C300/C350, E350/E550, CLS550, S550, SLK300 and other documented applications using #0021407460.
Product Overview
The secondary-air system adds fresh air to the exhaust during certain cold-start conditions to support emissions control. The one-way valve protects the pump and air hoses against exhaust backflow.
A secondary-air fault code, damaged vacuum line or valve that leaks exhaust backward can prompt inspection; test the pump and control solenoid as well.
Key Features & Performance
- One-way secondary-air injection valve
- Purpose: The secondary-air system adds fresh air to the exhaust during certain cold-start conditions to support emissions control.
- Application: Mercedes-Benz C230/C280/C300/C350, E350/E550, CLS550, S550, SLK300 and other documented applications using #0021407460.
Replaces / Cross-References
- 0021407460
- AV78
- 4V1304
What Is Included
One-way secondary-air injection valve. Check the listing photos for the exact delivered components.
Fitment Notes
Verify the valve's location, pipe fitting, vacuum control and engine emissions package. Refs AV78 and 4V1304 appear in aftermarket catalogs.
Frequently Asked Questions
What should I check before ordering?
Verify the valve's location, pipe fitting, vacuum control and engine emissions package. Refs AV78 and 4V1304 appear in aftermarket catalogs.
Is this a genuine OEM part?
No. This listing describes an aftermarket replacement or accessory unless the product is expressly identified as genuine OEM.
Part Summary
Keywords: Mercedes secondary air check valve, Air Injection Check Valve 0021407460 for Mercedes CLS550 SLK350 E350 S550 05-15, 0021407460, AV78, 4V1304, 05-15.
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, dimensions, and application before purchase.