"engine light turned on, and as per Audi manual, is an indication of bad catalytic converter."

"The exhaust mainfault is cracked so i need to replace it because its consuming to much petrol"

"EXHUST LEAK, LOSS OF POWER, CLOGGED IDLE"

"Need a cat replacement or dummy cat installed on my car."

"I have a check engine light and the OBD scanner shows that it's an Oxygen sensor. am thinking due to the once got stuck on low-level water. maybe it has rusted"

The user didn't provide a description

"NOISY AND RATTLING"

"Honeycomb was replaced by a gum gum"

"Vehicle not revving over 3000rpm. No power. Local workshop assest problem. Catalitic conveeter blocked."

"Engine Light came on, on the dashboard. Diagnostic test done and confirmed that Cat needs to be replaced"