Infiniti Engine Light Questions And Answers

Welcome to the Infiniti engine light Question and Answer Page! This page should save you some time from submitting a duplicate question and having to wait for a response. If you can't find the answers you're looking for here, feel free to submit your own question by using our "Get Help" link, or for immediate solutions, see our Wiring Diagrams page. We will include the model in most questions, so you can use the "Find on this page" function of your browser's "Edit" menu to get relevant info for whatever check engine light concerns you may have. For instance, just type in "QX-4" and search for responses relating to this vehicle. You could also type in an Infiniti engine light code number by itself such as "P1320" to get all related responses for this trouble code. Just keep hitting "Find next" to go through all relevant check engine light responses. We don't recommend including a model year as this may make your search too narrow, and you may miss out on some relevant posts.

Our Infiniti engine light resources cover a very wide range of concerns, but if you can't find what you're looking for through these links or our code listings, then visit the check engine light "Get Help" link on the navigation bar. As always, all repairs should be attempted only by a qualified individual. Please read our Disclaimer before getting started. Thanks for stopping in, and we hope you have found something helpful from our site!

Question:Hello. I have a 2001 Infiniti QX-4. I keep getting the code P1320 which is primary inition, as well as P0301 which engine knock sensor. I changed the plugs which were extremely worn and the code keeps setting. The car runs rougher now than before. Any ideas on what it could be?

Answer:Thanks for submitting your Infiniti engine light question! Your P1320 definition is correct but the P0301 is actually a misfire on cylinder 1. These codes combined would suggest a wiring concern with the coil circuit for cylinder 1 or a faulty coil on the same cylinder. I would suggest testing the wiring for cylinder 1 ignition circuit as outlined in our Automotive Circuit testing article, and then checking the resistance of the coil itself. An open circuit between pins 2 and 3 (where the Black and Red wires connect to the coil) would indicate a faulty coil. You could also swap out the coil with another cylinder and see if the concen moves. If it does, you likely have a faulty coil. also, read our code definition for P0301 on the Generic OBD II Codes page for complete testing info, and be sure to check our Wiring Diagrams page for help when testing all coil circuits. Let us know if we can be of any further assistance with this, or any future Infiniti engine light concerns! Have a great day!

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