Item: 171801

Bosch 509 Super 4 Spark Plug x4


(Unit price: £5.37 Ite)

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  • Description
  • Specification
  • Reviews
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  • The Bosch Super 4 operates on the state-of-the-art air-cushion-spark principle and is the first spark plug to feature four thin ground electrodes with one pointed, silver-plated center electrode.

    This combination is unique in the world and has decisive benefits. The ignition spark always chooses the best path for reliable ignition according to the engine load. The Bosch Super 4 does more than a conventional spark plug. In all situations, throughout its service life.

    Features & Benefits

    • Noticeable improvement in acceleration
    • Significantly improved engine smoothness
    • Superior engine versatility
    • Electrode gap adjusted ex factory
    *Image for illustrative purposes only

    Additional Information

    Please check with your vehicle manufacturer or workshop manual to confirm the suitability of this part for your vehicle.
  • Hex Size: 16
    Thread Length mm: 19
    Thread Size mm: 14 x 1.25
  • Rated 5 out of 5 by 2 reviewers.
    Rated 5 out of 5 by Good value for money All my life used bosh spark plugs, best for performance and price 03 January 2014
    Rated 5 out of 5 by Bosch super 4 I changed my old NGK plugs at 66k miles with these, and they transformed the performance of my car (Rover 25 1.4). It idles smoother, and the power delivery is seamless, plus it's using less fuel now. Overall i'm very pleased with this purchase and would recommend to anyone wanting to upgrade their plugs in the future. Bosch plugs are often criticized for being unreliable and generally not as good as NGK's, but in this case they have performed as well in my car. I mostly do short trips about 2 miles a day, and 2 days of about 30 miles a week. So the four electrode design is perfect for this because they can keep performing cleanly. 13 March 2013
    • 2016-10-26 T10:21:20.023-05:00
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Some of the parts we sell here at Halfords have been reconditioned. These will carry a Refundable Deposit or an extra surcharge amount. When you add one of these reconditioned items to your basket, we'll add this extra cost automatically.

Once you've sent us your old item we'll check it over, and then refund you the full surcharge as long as everything is ok.

Before you return your old unit please make sure it's in re-serviceable condition. So if you're returning caliper casings, you'll need to double check they aren't badly damaged or broken. If the part you've sent is found to be unserviceable, we reserve the right not to refund the surcharge.

Please note that if you're returning your old unit to our National Returns Centre then this will be at your own expense.

Bosch Spark Plugs

Bosch 509 Super 4 Spark Plug x4

£21.49 Bosch 509 Super 4 Spark Plug x4