



⚡ Spark your drive with Bosch’s double iridium power — because your engine deserves the best!
The BOSCH9603 OE Fine Wire Double Iridium Spark Plug features a 360-degree laser-welded ultra-fine iridium firing pin and ground electrode, delivering 4X longer life and up to 24% reduced voltage requirements compared to standard plugs. Its nickel-plated rolled threads resist corrosion and require no anti-seize, while factory pre-gapping ensures easy installation. Designed to meet or exceed OEM standards, it fits a wide range of modern gasoline engines, including Gasoline Direct Injection models.




| Brand | Bosch |
| Core Material | Iridium |
| Thread Size | 1.25mm |
| Top Material Type | Nickel |
| Vehicle Service Type | Car |
| Global Trade Identification Number | 00028851010375 |
| Automotive Fit Type | Vehicle Specific Fit |
| UPC | 028851010375 |
| OEM Part Number | 9603 |
| Manufacturer | Bosch Automotive |
| Model | Spark Plug |
| Item Weight | 0.8 ounces |
| Product Dimensions | 4 x 7 x 9 inches |
| Item model number | 9603_1 |
| Exterior | Machined |
| Manufacturer Part Number | 9603 |
| Position | Front, Rear |
S**N
Solid, reliable park plugs
I got these for my 2002 GS430 and boy do they help get all the power out of my engine. I have an exhaust leak and trans leak that leads to a laggy bogged down performance, but by swapping out with these plugs yearly I can keep the power more responsive. I tried other plugs, but these seem to do the best for me in my case. Installation was straight forward and these tightened in place great with a little bit of antiseize.
L**A
Excelente
Justo lo que pedi
L**.
Great Product
Purchased this product for my 2004 Toyota Tundra and so far it is doing the job as intended. My truck now accelerate as it should without any hesitation. It arrived well packaged and gapped. A great replacement at a great price!
F**N
Great
Thank You
J**H
good item
i bought 4 sparks for my friends,because he is not the amazon prime membership,he said it is well for his Camry and more powerfull,just a little expensive. Last year i bought 6 sparks and just costed 23
T**M
Great Fit for Lexus RX330 2004
Fast delivery and perfect product fits well on my lexus RX 330 model 2004 , i recommend it to Lexus owners as it lasts for a long time.
S**I
As expected
Exactly what you think they are. Work fine with no issues.
A**R
Worth the money
My 2004 Toyota Highlander runs smoother and is a good pick-up. So far so good. Best spark plugs ever bought.
Trustpilot
2 weken geleden
5 dagen geleden