So I have by Timing chain guides replaced first under CPO - March 2017. Had to have it done again June 2018 as the chains were never replaced and were getting the P0018-00 code - crank sensor - not covered under CPO - but they did cover part of the cost of the job, but not all of it. Now... I am getting the P0018-00 code again - I have an appointment, but could it be another problem other than the timing chain guides. I have only driving about 7,000 KM since the last job was completed. I have a 1 year warranty on the job, but would there be another issue?