PT Cruiser NOx Catalyst Failure Fix Guide & Costs

Having experienced similar issues with my Chrysler 300C diesel from 2008, I can relate to your exhaust system concerns. The symptoms you describe match what I encountered, check engine light and exhaust leak warnings pointing to emissions system problems. The NOx catalyst degradation is a common issue in these engines at higher mileage. In my case, the automotive repair shop discovered multiple problems: a cracked exhaust manifold gasket causing the leak, and a failing NOx storage catalyst affecting the emissions readings. The repair required replacing both the gasket and the catalyst. This was indeed a serious issue since a failing NOx catalyst can lead to increased emissions, poor fuel economy, and potential engine performance problems. The exhaust leak also posed risks to air quality and could cause damage to other engine components if left unaddressed. The complete repair involved: Removing the old exhaust system components, Installing new manifold gaskets, Replacing the NOx catalyst, Performing a system reset, Running emissions tests to confirm proper function While this was a significant repair, it resolved all the warning lights and restored proper emissions control. These issues typically dont fix themselves and tend to worsen over time, affecting both performance and emissions compliance.

Thanks for your detailed explanation of the NOx catalyst and exhaust system repair process. Your experience with the Chrysler 300C sounds very similar to my PTCruiser situation. I am planning to visit a repair shop this week. Do you remember roughly how much you paid for the complete fix? Also curious if you have experienced any other emissions system issues since the repair was done. It would help me understand if this is typically a permanent solution or if I should expect other catalytic converter problems down the road.

After taking my Chrysler 300C to the mechanic, I am happy to report the NOx storage catalyst aging issue was completely resolved. The main problem turned out to be a leak in the exhaust system which cost 265€ to repair. The fix involved sealing the leak and recalibrating the emissions system sensors. Since the repair my vehicle has been running perfectly with no check engine lights or emissions system warnings. The catalytic converter and overall NOx emissions are now within normal parameters. This type of repair typically provides a long-term solution when done correctly. In my case, it has been several months without any new exhaust system problems. Based on my experience, once the exhaust leak is properly sealed and the NOx catalyst is functioning correctly, you should not expect recurring issues. Just ensure regular maintenance is performed to keep the emissions system working optimally.

Thanks for the input. I finally got my PTCruiser checked at the repair shop yesterday. The mechanic confirmed it was indeed a failing NOx storage catalyst combined with a cracked exhaust manifold. The total repair came to 890€, which included replacing the catalytic converter and fixing the exhaust system leak. The process took about 6 hours. They had to remove several components to access the damaged parts of the exhaust system. The mechanic showed me the old catalyst which was completely clogged, explaining why my emissions readings were so high. After the repair, I immediately noticed the engine running smoother and quieter. The check engine light is now off and a quick emissions test showed everything working properly. The mechanic mentioned this should be a long-term fix as long as I maintain regular service intervals. For anyone facing similar nitrogen oxides issues, getting it checked early definitely saves money in the long run. Waiting too long can lead to more extensive damage to the emissions system components.