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          NGK CZ303 - Diesel Glow Plug

          MPN: CZ303
          The NGK CZ303 Diesel Glow Plug ensures reliable ignition for Mercedes-Benz diesel engines, improving cold start performance and reducing emissions. Designed for easy installation.
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $42.95
          In stock

          Product Overview

          The NGK Diesel Glow Plug part number CZ303 is an essential component engineered for optimal performance in Mercedes-Benz diesel engines. This glow plug meets and exceeds OEM specifications, ensuring reliable operation and longevity. Designed for various vehicle families including the Sprinter and GLE series, it provides dependable ignition for smooth engine startups, especially in cold conditions. Choose NGK CZ303 for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This NGK CZ303 is equivalent to or replaces the following part numbers: A 001 159 66 01, 9970.

          Vehicle Compatibility

          • Mercedes-Benz Sprinter 2500 3.0 V6 (2020–2021)
          • Mercedes-Benz Sprinter 3500 3.0 V6 (2020–2021)
          • Mercedes-Benz Sprinter 3500XD 3.0 V6 (2019)
          • Mercedes-Benz GLE300d 2.1 L4 (2017)
          • Mercedes-Benz E250 Bluetec 2.1 L4 (2015–2016)
          • Mercedes-Benz ML250 Bluetec 2.1 L4 (2015)
          • Mercedes-Benz E350 Bluetec 3.0 V6 (2012–2013)
          • Mercedes-Benz R350 Bluetec 3.0 V6 (2011–2012)
          • Mercedes-Benz GL350 Bluetec 3.0 V6 (2009–2010)
          • Mercedes-Benz E320 Bluetec 3.0 V6 (2008–2009)

          This may also fit other applications. Please use the vehicle selector tool to verify fitment.

          Why Shop at eEuroparts.com?

          • Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
          • Exclusive Kits That Fitâ„¢ - complete repair solutions with no guesswork
          • Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
          • Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
          • Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
          • Established Trust: Serving the European auto community since 2000.

          Frequently Asked Questions

          What does the NGK CZ303 Diesel Glow Plug do?

          The NGK Diesel Glow Plug CZ303 is designed to provide reliable ignition for diesel engines by heating the combustion chamber, ensuring smooth starts, especially in cold conditions. This improves fuel efficiency and reduces emissions.

          How do I know if my Diesel Glow Plug needs replacement?

          Key signs that indicate the glow plug may need replacement include difficulty starting the engine, rough idling, increased emissions, and a decrease in fuel efficiency.

          Can I install the NGK CZ303 myself?

          Yes, the installation of the NGK CZ303 Diesel Glow Plug is straightforward and can be performed by DIY enthusiasts. However, ensure proper precautions are taken to avoid damage.

          What are the symptoms of a faulty Diesel Glow Plug?

          Common symptoms of a faulty glow plug include hard starts, engine misfires, and increased smoke from the exhaust. If you encounter these issues, check the glow plug functionality.

          Why should I choose NGK for my Diesel Glow Plug needs?

          NGK is a trusted brand known for quality and reliability. Order NGK CZ303 today for a factory-correct replacement that restores safety and performance.

          Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.

            • eEuroparts SKU
              136315
            • Weight
              0.07 lbs
            • Manufacturer Part #
              CZ303
          • Brand
            NGK
          • Manufacturer
            NGK
          • MPN
            CZ303
          • Part Type
            Diesel Glow Plug
          • OE Part Numbers
            A 001 159 66 01, A0011596601
          • Cross Reference Numbers
            9970
          • Features
            Hex Size : 8
            Length : 5.86
            Material Type : Ceramic Type
            Part Number : CZ303
            Seat Type : Flat
            Stock Number : 9970
            System Voltage : 12.0
            Terminal Thread Size : M4
            Terminal Type : Pin
            Thread Diameter : 0.313
            Voltage : 7.00
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          2007Mercedes-BenzML320CDI (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2007Mercedes-BenzR320CDI (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2007Mercedes-BenzE320Bluetec (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2007Mercedes-BenzGL320CDI (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2008Mercedes-BenzE320Bluetec (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2008Mercedes-BenzML320CDI (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2008Mercedes-BenzR320CDI (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2008Mercedes-BenzGL320CDI (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2009Mercedes-BenzE320Bluetec (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2009Mercedes-BenzML320Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2009Mercedes-BenzR320Bluetec (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2009Mercedes-BenzGL320Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2010Mercedes-BenzGL350Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2010Mercedes-BenzML350Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2010Mercedes-BenzR350Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2011Mercedes-BenzML350Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2011Mercedes-BenzE350Bluetec (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2011Mercedes-BenzGL350Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2011Mercedes-BenzR350Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2012Mercedes-BenzR350Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2012Mercedes-BenzGL350Bluetec 4Matic (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2012Mercedes-BenzE350Bluetec (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2013Mercedes-BenzE350Bluetec (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2013Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2013Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2013Mercedes-BenzGLK250Bluetec 4Matic (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2014Mercedes-BenzE250Bluetec (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2014Mercedes-BenzE250Bluetec 4Matic (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2014Mercedes-BenzGLK250Bluetec 4Matic (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2014Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2014Mercedes-BenzSprinter 2500Base (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2014Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2014Mercedes-BenzSprinter 3500Base (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2015Mercedes-BenzE250Bluetec (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2015Mercedes-BenzE250Bluetec 4Matic (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2015Mercedes-BenzML250Bluetec 4Matic (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2015Mercedes-BenzGLK250Bluetec 4Matic (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2015Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2015Mercedes-BenzSprinter 2500Base (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2015Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2015Mercedes-BenzSprinter 3500Base (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2016Mercedes-BenzE250Bluetec (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2016Mercedes-BenzE250Bluetec 4Matic (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2016Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2016Mercedes-BenzSprinter 2500Base (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2016Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2016Mercedes-BenzSprinter 3500Base (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2016Mercedes-BenzGLE300d4Matic (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2017Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2017Mercedes-BenzSprinter 2500Base (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2017Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2017Mercedes-BenzSprinter 3500Base (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2017Mercedes-BenzGLE300d4Matic (2.1 L4 DIESEL)Notes: 8mm Thread Size, with 148.9mm Overall Length, Actual OE Manufacturer
          2018Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2018Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2018Mercedes-BenzSprinter 3500XDBase (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2019Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2019Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2019Mercedes-BenzSprinter 3500XDBase (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2020Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2020Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2020Mercedes-BenzSprinter 3500XDBase (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2021Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2021Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2021Mercedes-BenzSprinter 3500XDBase (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2022Mercedes-BenzSprinter 3500XDBase (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2022Mercedes-BenzSprinter 3500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
          2022Mercedes-BenzSprinter 2500Base (3.0 V6 DIESEL)Notes: Actual OE Manufacturer
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          Warranty Overview

          At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.

          Standard Warranty – Most Parts

          • Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.

          • Protection: Defects in materials or workmanship under normal personal use.

          • Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.

          • Exclusions:

            • Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)

            • Commercial, fleet, rideshare, off-road, or racing use

            • Improper installation, misuse, accidents, or modifications

          • Not Covered: Labor, shipping, towing, or incidental costs.

          Bison Performance Warranty – Our House Brand

          • Coverage: Limited Lifetime Warranty for as long as you own your vehicle.

          • Applies To: All products sold under the Bison Performance label.

          • Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.

          • Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).

          • What’s Included: Replacement of the defective product (labor and shipping excluded).

          Warranty Claim Requirements

          To keep claims fast and fair, we require:

          • Proof of purchase (invoice or order confirmation).

          • Photos or videos showing the defective part, order number, date, VIN, and odometer reading.

          • Diagnostic reports or part returns for non-visible issues may be requested.

          • Claims must be truthful, properly documented, and reflect normal consumer use.

          Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.

          For full details and exclusions, please see our complete Warranty Terms & Conditions.

          This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.

          Return Policy Overview

          Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
          To start a return, contact customer support via Chat or Contact Us.

          • Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)

          • Refunds: Issued to your original payment method within 3–5 business days after inspection

          • Exchanges: Not automatic — please return and reorder

          • Replacements: May be approved for incorrect or defective items reported within 7 days

          Not returnable:

          • Used or installed parts

          • Electrical components

          • Opened filter kits, gaskets, or contaminated items

          • Final sale or custom orders

          Important Notes:

          • Return shipping is your responsibility unless we made a verified error

          • Fitment is the customer’s responsibility (we can assist, but do not guarantee)

          • Country of origin may vary and is not grounds for return

          For complete details, please see our full Return Policy.


          This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.

          Fast, Reliable Shipping — Straight to Your Door

          We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.

          • We use trusted carriers like UPS, FedEx, and USPS.

          • Tracking info is emailed to you as soon as your order ships.

          • Delivery estimates at checkout are based on carrier data, but not guaranteed.

          Need help with a shipment?

          If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.

          For complete details, please see our full Shipping Policy.


          This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.

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