Savana NOx Catalyst Leak Causing Check Engine Alert

Had a similar problem with my 2018 GMC Canyon. The car diagnostics revealed issues with the NOx catalyst, which was causing incomplete conversion of emissions. The exhaust leak was actually coming from a cracked flex pipe near the catalyst. The emissions system needed significant work. The NOx catalyst was partially melted due to running rich for too long, and the oxygen sensors were not reading correctly. This combination was causing both the exhaust leak and the check engine light. This is typically a serious issue that requires immediate attention, as it can lead to: Further damage to the exhaust system components, Failed emissions tests, Reduced fuel efficiency, Risk of exhaust fumes entering the cabin The repair involved replacing the NOx catalyst, both oxygen sensors, and the damaged flex pipe section of the exhaust system. These parts need to be OEM or high-quality aftermarket to ensure proper emissions control. Best approach is to get a complete exhaust system inspection from a certified shop with experience in emissions repairs. Make sure they perform proper car diagnostics before starting any work.

Thanks for sharing that experience. My GMC also had problems with the emissions system and the air quality was really suffering. Looking at getting it fixed soon. Can you remember roughly what you ended up paying for the full repair job? Also curious if youve had any other catalyst or exhaust issues pop up since getting it fixed? Just trying to figure out if I should budget for potential future problems with my Savana.

After taking it to a certified mechanic, the NOx storage catalyst aging issue was completely resolved. The repair involved fixing a leak in the exhaust system which cost 265 Euro for parts and labor. This comprehensive fix addressed all the air quality concerns I was experiencing. Since the repair, the exhaust system has been running perfectly with no check engine lights or emissions issues. Car diagnostics show everything is functioning as it should. The NOx emissions are now within normal range, and I havent experienced any additional catalyst problems in the past 8 months. Based on my experience, once properly fixed by a qualified technician, these issues rarely return. Just make sure to follow regular maintenance schedules and address any new warning lights promptly. The initial cost might seem high, but proper automotive repair prevents more expensive problems down the road.

I took your advice and finally got my Savana checked out. Found a certified shop specializing in exhaust system repairs. The mechanic confirmed the NOx catalyst was failing and discovered a cracked pipe causing those fumes. The total repair came to 890 Euro, which included replacing the catalyst and fixing the exhaust leak. The nitrogen oxides emissions are now properly controlled and the air quality is much better. The check engine light is gone and the engine runs smoother. I made sure to keep all documentation and warranty info for the new parts. The mechanic said regular maintenance should prevent similar issues in the future. Much better experience than my last repair shop, they took time to explain everything and show me the damaged parts. Overall relieved to have this fixed properly. The exhaust system is working perfectly now and no more worrying about harmful fumes. Thanks for helping me avoid getting overcharged on this repair.