When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Auto Zone told my after hooking my truck to this hand held error tester. Said my #6 Cyl plug was bad. I'm not sure which one is #6 six or really how to change it? It has Coils and boots.