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Part #: 7434

Bosch 7434 Spark Plug

OE Fine Wire Double Iridium
⚙️ 63 vehicles fit this part
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✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦OE Fine Wire Double Iridium
🚗Fitment: Mercedes-Benz, C300, C350, C43 AMG, C450 AMG, CLS400, E350, E400, E43 AMG, E450, GLC43 AMG, GLE350, GLE400, GLE43 AMG, GLE450 AMG, GLE550e, GLS450, ML400, S450, S550e, SL400, SL450, SL550, and SLC43 AMG
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Bosch OE Fine Wire Double Iridium Spark Plug 7434

Bosch 7434 is an OE Fine Wire Double Iridium spark plug built for direct replacement performance in select Mercedes-Benz applications. It combines a fine-wire iridium center electrode with a laser-welded tapered ground electrode for strong ignitability, stable combustion, and long service life.

Compatible With Mercedes-Benz C300, C350, E350, E400, GLE400, GLE350, GLS450, SL450, and other listed applications, this plug is supplied with a preset gap and should not be regapped during installation.

OE Fine Wire Double Iridium Design

  • Part number 7434 from Bosch OE Fine Wire Double Iridium
  • Iridium center electrode firing pin for consistent spark delivery
  • Laser-welded ground electrode with iridium alloy inlay
  • Tapered ground electrode tip design for improved ignitability
  • Resistor spark plug with 1000 ohm resistance
  • Projected ceramic insulator and flat seat construction
  • Preset .7 gap; do not gap before installation

Detailed Product Overview

Bosch OE Fine Wire Double Iridium plugs are engineered for drivers who want OE-style ignition performance with extended durability. The fine-wire center electrode and tapered ground electrode help promote efficient spark formation, while the double iridium construction supports long-term wear resistance under demanding engine conditions. Part number 7434 is a 4-cycle spark plug with a 12 mm thread diameter, 14 mm hex, 26.5 mm reach, and heat range 6.

This Bosch 7434 spark plug is listed for a wide range of Mercedes-Benz models, including 2012-2016 Mercedes-Benz E350, 2013-2014 Mercedes-Benz C300, 2012-2014 Mercedes-Benz C350, 2015-2018 Mercedes-Benz E400, 2016-2019 Mercedes-Benz GLE400, and 2017-2021 Mercedes-Benz C43 AMG. It also covers additional Mercedes-Benz applications such as GLE350, GLS450, SL450, SLC43 AMG, and E43 AMG.

This part cross-references no listed interchange part numbers in the provided data.

Common Issues This Spark Plug Addresses

  • Rough idle caused by worn ignition electrodes
  • Hard starting from weakened spark output
  • Misfire conditions related to plug wear
  • Reduced throttle response from inconsistent combustion
  • Service intervals requiring OE-style spark plug replacement

Installation Notes and Tips

  • Fits 2012-2016 Mercedes-Benz E350, N/A
  • Fits 2013-2014 Mercedes-Benz C300, N/A
  • Fits 2012-2014 Mercedes-Benz C350, N/A
  • Fits 2015-2018 Mercedes-Benz E400, N/A
  • Fits 2016-2019 Mercedes-Benz GLE400, N/A
  • Fits 2017-2021 Mercedes-Benz C43 AMG, N/A
  • Do not gap this spark plug; the gap is preset from the factory
  • Verify engine application by year, make, and model before installation
  • Use the correct torque procedure for the cylinder head and plug seat type

Quality Assurance

Bosch OE Fine Wire Double Iridium plugs are built to OE-level specifications with laser-welded electrode construction and iridium-alloy materials for durability and consistent ignition performance. Part number 7434 is packaged as one spark plug.

BrandBosch
Part Number7434
PositionOE Fine Wire Double Iridium
Resistance1000
Ground Electrode Tip DesignTapered
Ground ConfigurationStandard
Ground Electrode Core MaterialCopper
Center Electrode Tip MaterialIridium
Pre-Gap Size.7
Ground Electrode Quantity1
Hex Size14
Manufacturer Heat Range6
Seat TypeFlat
Reach26.5
Thread Diameter12
Additional Accessories IncludedNo
Cases Per Pallet (ORLY)60
Center Electrode Core MaterialNickel-chromium-iron and copper
Ground Electrode Tip MaterialPlatinum and nickel-chromium-iron and copper
Insulator MaterialCeramic
Insulator TypeProjected
Outdoor Power Equipment ApplicationNo
Package ContentsSpark plug
Package Quantity1
Private Brand?No
Product Length3.326772 in
Product Width0.669291 in
ResistorYes
Short StyleNo
Spark Plug Type4-cycle
Unit(s) per Car Qty (ORLY)6

This part fits 63 vehicles. Search below:

YearMakeModelDrive TypeLitersCylindersFuel TypePositionNotes
2021Mercedes-BenzC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2020Mercedes-BenzC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2020Mercedes-BenzE450RWD3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2020Mercedes-BenzS4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2020Mercedes-BenzSL4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2020Mercedes-BenzSL5504.7LV8N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2020Mercedes-BenzSLC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2019Mercedes-BenzC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2019Mercedes-BenzE4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2019Mercedes-BenzGLE4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2019Mercedes-BenzGLE43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2019Mercedes-BenzGLS4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2019Mercedes-BenzS4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2019Mercedes-BenzSL4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2019Mercedes-BenzSLC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzE4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzE43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzGLE3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzGLE4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzGLE43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzGLE550e3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzGLS4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzS4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzSL4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2018Mercedes-BenzSLC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzCLS4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzE4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzE43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzGLC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzGLE3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzGLE4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzGLE43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzGLE550e3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzGLS4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzS550e3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzSL4503.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2017Mercedes-BenzSLC43 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzC450 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzCLS4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzE3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzE4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzGLE3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzGLE4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzGLE450 AMG3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzGLE550e3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzS550e3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2016Mercedes-BenzSL4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2015Mercedes-BenzCLS4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2015Mercedes-BenzE3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2015Mercedes-BenzE4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2015Mercedes-BenzML4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2015Mercedes-BenzS550e3.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2015Mercedes-BenzSL4003.0LV6N/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2014Mercedes-BenzC3003.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2014Mercedes-BenzC3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2014Mercedes-BenzE3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2013Mercedes-BenzC3003.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2013Mercedes-BenzC3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2013Mercedes-BenzE3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2012Mercedes-BenzC3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium
2012Mercedes-BenzE3503.5LV6FLEXN/ADo Not Gap, Gap is Preset; Available Until Inventory Is Depleted; Original Center Electrode Material is Iridium; OE Fine Wire Double Iridium

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

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