Infiniti Repair Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for your question,High hydro carbon reading are in most cases due to a higher amount of fuel being unburned and in your cases it very minimal. CO reading being high would indicate a rich condition. Since your CO reading are well with in specs you are not running rich. If the spark plug and cap as well as the spark plugs have not been changed the last 30 to 40,000 miles then I would go ahead and doe this as well as having the injector cleaned and you should be ine.