NGK 58939 direct ignition coil boot for the 2003-2007 Ford Focus 4-cylinder 2.3L, the 2005-2011 Focus 4-cylinder 2.0L and other vehicles connects the ignition coil to the spark plug. The NGK direct ignition coil boot is built to stringent OEM tolerances, matching original equipment fit and design.
A cracked, torn or burn-marked boot, or a misfire and rough idle, can be a sign the boot needs replacing. Before you replace it, rule out the coil, the spark plug and the wiring as the source of the misfire. Boots should be changed at the same time as the spark plugs, which helps prevent ignition problems such as flashover.
It also fits the 2005-2008 Ford Escape 4-cylinder 2.3L and the 2010-2013 Ford Transit Connect 4-cylinder 2.0L. Four boots go on each engine.
Interchange: 50033-1 · 175-1045 · 35-7008 · 671-4283 · 36-2055 · CPB-FD007
50033 · SPB151 · 702443 · 727443 · 02528 · 2528 · 124018 · SPP88 · SPP88E
This part cross-references / interchanges with the following part numbers:
Is NGK 58939 the right boot for a 2005-2011 Ford Focus 4-cylinder 2.0L?
Yes. NGK 58939 fits the 2005-2011 Ford Focus 4-cylinder 2.0L, and that engine takes four. If your car is not named on this page, check it in the "Vehicles it fits" section.
What is the NGK 58939 boot made of, and what is inside it?
NGK 58939 is made of silicone and includes the internal springs and ferrite resistors it requires. The ferrite resistors provide RFI noise suppression.
Does NGK 58939 replace boot number SPB151?
Yes. SPB151 is one of the numbers NGK 58939 replaces, and NGK also lists this boot under its own number CPB-FD007.
How can I spot a damaged direct ignition coil boot?
With the engine off and cool, look for a boot that is cracked, torn or burn-marked. A shop can test the ignition system if you notice a misfire or rough idle.
Does this NGK boot come with a warranty?
Yes. NGK covers this boot with a limited lifetime warranty. The package has the details.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
