Dorman 42109 Extended Spark Plug Non-Fouler - Universal Fit, 2 Pack
Description
⚡ Keep your engine firing flawlessly—because every spark counts!
- BUILT TO LAST - Crafted with premium materials for reliable, long-term performance
- TRUSTED EXPERTISE - Backed by over 100 years of automotive innovation and ASE-certified support
- READY FOR CUSTOMIZATION - Exterior can be painted to match your engine bay aesthetics
- EFFORTLESS UNIVERSAL FIT - Seamlessly replaces original non-foulers without hassle
- MAXIMIZE SPARK PLUG LONGEVITY - Protects plugs from fouling and damage, saving you costly repairs
The Dorman 42109 Extended Spark Plug Non-Fouler is a universal-fit, corrosion-resistant component designed to protect spark plugs from fouling and damage. Made with durable materials and backed by over a century of automotive expertise, this 2-pack ensures easy installation and extended spark plug life, supported by ASE Blue Seal Certified technical assistance.
Specifications
| Manufacturer | Dorman Products |
| Brand | Dorman |
| Item Weight | 3.84 ounces |
| Product Dimensions | 6.75 x 1.77 x 0.94 inches |
| Country of Origin | China |
| Item model number | 42109 |
| Exterior | Ready To Paint If Needed |
| Manufacturer Part Number | 42109 |
Reviews
A**R
Don't drive a fouled plug.
So there I was.. I couldn't renew my registration due to a fouled downstream spark plug. I didn't know what to do. I tried cleaning the spark plug but it didn't help. I tried resetting the PCM but my spark plug would become fouled again. Finally I purchased this non-fouler for my spark plug. It keeps it from becoming fouled by keeping it out of the exhaust stream.
Y**O
Dorman 42109 Extended Spark Plug
everything is fine
J**S
98 mustang gt
Worked on my catless X pipe to prevent CEL. Been almost a year and still working.
W**E
Perfect fit
Unsure if works as ive seen on diy video. O2 sensor
A**.
Great option
These are great and make sure your check engine light stays off. Easy to install and fit perfectly.
E**C
Worked for me
If you are looking at these you know what they are for. They worked for me. I seem to remember the older versions of these were a bit thicker metal but these have held up and are helping me keep the codes from coming back. Some drilling maybe required.
W**L
No more engine light!
Works great for catalytic code P420 engine light. No longer a worry for me!
J**S
Together, this fixed my problem on F-150.
Threaded on good. Fixed my issue. No codes.
Common Questions
Trustpilot
2 months ago
1 month ago
