Catalyst System Efficiency Below Threshold

The vehicle is subject to NHTSA Safety Recall Campaign 18V-735 (Ford Recall 18S32) regarding a defective Canister Purge Valve (CPV) that causes fuel vapor saturation, excessive fuel tank vacuum, fuel tank deformation, and engine stalling.The vehicle presented with an active check engine light for diagnostic trouble code P0420 (Catalyst System Efficiency Below Threshold). Ford technical service instructions under Recall 18S32 explicitly link code P0420 to a stuck-open CPV dumping unmetered fuel vapors into the exhaust stream. The franchised dealership initially performed only a software calibration without replacing the mechanical valve.Upon return, the dealership confirmed the defect and…

The welding that holds the exhaust together has failed. They offer a Special Warranty to cover only the passenger side, however it has failed and exhaust is super loud. Also reading 4 codes from check engine alert. All are P0420 (cat convertor). The smell of exhaust and cat convertor is super disgusting

Keep having the engine light on. First time it was my Catalyst and now my engine light is on again with code P0420 and keeps leaving from the coolant

I own a 2018 Dodge Journey Crossroad V6. I am submitting this complaint because I have experienced multiple serious and recurring problems with the vehicle. The vehicle has had multiple transmission repairs/replacements. I have spent a significant amount of money addressing transmission problems, yet I continue to have major mechanical issues with the vehicle. The vehicle is also experiencing catalytic-converter/emissions-system problems. The check-engine light is on and the vehicle has produced diagnostic trouble codes P0420 and P0430, indicating catalyst-system efficiency problems affecting both banks. I am concerned about the reliability and safety of continuing to operate the vehicle…

Where to begin. I bought the vehicle brand new with 29 miles on it in April of 2017, January of 2019 I started having issues. My check engine light kept coming on and it affected my gas mileage and speed. I had stopped at a chevy dealership in Forest Lake Minnesota and had them scan the vehicle to see what was going on and made an appointment to bring it back in for a full diagnostics. I get there and they asked me if I had another vehicle with me because it would take about a week of it being there. First off, I hadn't agreed to anything yet, I still did not even know what was wrong with it yet. They ended up doing what they said was a full diagnostic on the vehicle (which cost me almost…

Brought my 2020 Ford F150 2.7L EcoBoost in for mandatory emissions recall 24E12. Vehicle had zero dashboard lights or performance issues prior. Immediately upon completion of the PCM flash, the check engine light activated. When the truck was scanned I am now receiving a P0420 and P0430 catalytic converter efficiency codes. The dealership is now requiring $6000 for replacement of qty 2 catalytic converters caused by the recall parameters. This is a predatory compliance software update designed to shift manufacturing component failures onto the consumer after the 80k mile warranty window (truck has 105k). I have filed a complaint with Ford and asked for a P01 Financial Review for…

Car uses excessive amount of oil! We have had the timing replaced and now it’s stating the P0420 catalyst system efficiency below threshold bank 1.

Statement for NHTSA Subject: Safety Complaint – 2021 Chevrolet Silverado Unexpected Jerking/Harsh Transmission Engagement I am submitting this complaint regarding my 2021 Chevrolet Silverado 1500 2.7L Turbo with approximately 128,000 miles. My vehicle has developed a recurring problem involving harsh/jerking transmission engagement, hesitation, shuddering and abnormal shifting. The truck can jerk when engaging or changing gears and has also experienced a hard engagement when shifting from Reverse into Drive. During normal driving, the vehicle can hesitate or feel as though it is repeatedly fluttering/shifting instead of providing smooth and predictable acceleration. The vehicle has produced…

Intermittently my van will lose power, all dash lights will pop up, active parksense unavailable, service required , blind spot alert temporarily unavailable , service shifter, fcw unavailable service required, service electronic stability control will pop up on the dash and in the message center. Code p0420 has popped up on a reader. Several trips to the dealership purchased at, and they cannot figure out the issues. I have 2 kids, this is a major safety concern. I had it shutdown on a highway 3 weeks ago with my 9 month old in the van. Recall list says everything was repaired, but it seems there needs to be more recalls. These vans are not safe. Recall them all. Chrysler is going to end up…

The primary component that failed is the turbocharger system, which has malfunctioned five times since October 2024. Additional failures include the catalytic converter, and there is now suspected motor damage. These components are currently in possession of the dealership and are available for inspection upon request. The safety of myself and my children was repeatedly put at risk. The first turbocharger failure left us stranded in early morning traffic, with no engine power and limited ability to exit the roadway safely. Subsequent failures occurred within 24 hours of service completion. These breakdowns created dangerous roadside conditions, especially during high-traffic hours and in…