Check Engine Soon Light came out twice within one month. PC module was replaced.
Check Engine Light came back on. Dealer replaced the oxygen sensor. Check engine light came back on a few days after the oxygen sensor was replaced on 10/11. Took it back to the dealer on 10/23. Dealer checked for codes. PO137, P2096. Rear oxygen sensor low voltage. Post cat lean. Checked wiring from rear oxygen sensor to PCM. Wiring was good. Monitored fuel trims - good.. Swap engine. No vacuum leaks found. Checked fuel pressure - good. Advised to try different source of fuel. Didn't work. Light has come back on.
Check Engine Light was on again. Dealership technician said the oxygen sensor should be replaced. They still cannot figure out what triggers the check engine light on so very often. Dealership replaced the oxygen sensor one more time, the check engine light came on again just in three days after the replacement.
Returned the vehicle to the dealership at the end of the lease.
The check engine light came on, and I took the car to the dealership. They "reflashed" something and I was on my way.
Fuel filler neck modification recall. Bolt removed from filler neck to prevent possible fire in the event of a crash.
Threw check engine light. Fault was cleared by dealer
Fuel pump was leaking internally, contaminating engine oil. The oil level would show over full. Analysis shows fuel in the oil. Changed fuel pump, and has been ok for 2 months. This took several trips & oil changes to diagnose.
Getting fuel contamination into engine oil. Computer updates, check injectors, pumps and all fuel related components. Seems to run properly, time will tell if problem fixed.
Have had issues from day 1 with fuel dilution in the engine oil. This time the ECM was reprogrammed and after 4000 kms, the problem seems to be fixed. Oil looks ok, no fuel smell, level does not fluctuate. It's never been this good so hoping problem has been solved.
Dealer detected a head gasket leak during normal maintenance visit and recommended repair. Took 1.5 days to fix. Repair wasn't properly done; coolant tank then emptied on the engine while driving, had to tow to a nearby dealer to fix that.
Ignition system went totally haywire. Got "Keyless system malfunction" error codes (no start), OBD codes relating to ABS and SBCS systems, throttle bottle and starter clicking constantly after the car was turned off. Most concerningly it ended up devolving into a situation where we could not turn off the engine without pulling a fuse. The car would cycle through "off," accessory, and on modes inside (gauges, accessories, etc.), but the engine remained on and running the whole time. I was able to usually return the car to a drivable by disconnecting the battery and waiting long enough for the ECU to reset. The vehicle spent days at the dealer but they were unable to find anything wrong. We ended up trading the vehicle in for another brand. Some research I did indicated it might be related to multiple TSBs related to the ignition system for 2013-early 2014 CX-5s. The car was unsafe...should've been a recall.
Valve cover gasket was leaking
Valve Cover gasket
Reflashed my engine management system after downloading all data. Vehicle not getting anywhere near EPA. Computer and manual recordings have mid-teens MPG. Update: at 4,400 miles finally getting EPA numbers. Maybe engine just needed to break in.
Vehicle stalled when foot was off the gas pedal. MAF sensor was diagnosed as deficient, and replaced. Problem solved.
Engine check light on; the mechanic stated that there is a small leaking in the emission system, probably from gas cap.
Had a leak at the connector between the exhaust and flange to the cat. Causing a check engine light.
Service Technician mangled the air box clamp during filter replacement. Simply put they broke it and I had to pay for fixing it.
The air sensor had to be replaced.
Defective ignition coils and spark plugs replaced
engine wasnt coming up to running temp.told was bad T-stat. replaced and was sent on my way. Cel came on again,checked code and same issue.waiting to hear from mazda NA to get it repaired again. repeat CEL with not coming to running temp.
reflash of comp due to mil on from engine not coming to proper heat range
Faulty spark plug ignition coil, cylinder #3. Replaced coil and all 4 spark plugs.
Air flow sensor malfunction, it was replaced and fee covered under 3 year warranty.
Ignition coil misfired.
Vehicle was throwing codes due to bad communication and calibration errors. Reading as a faulty MAF (which wasn't faulty) Mechanic found potentially corrupted files in the computer and flashed it to a different version of software and this appears to have fixed the problems -- suspect that this issue was related to ongoing electrical issues with the vehicle since Dec 2016.