Check Engine Light Due to Catalytic Converter Failure on Nissan Sentra

The catalytic converter closest to the cylinder head can fail causing illumination of the Check Engine Light. Prompt repair of this problem is recommended because the catalyst material can be sucked into the engine and cause internal damage.

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Average mileage: 121,929 (59,645–185,331)
Exhaust & Emissions affected: 2.5L 4 Cylinder
12 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
46 people reported this problem
19 people shared problem details
2008 Nissan Sentra91,860
Took my vehicle in for service. I had the coolant line flushed and fuel line flushed and diagnostic code check. The service engine soon light was on when I took it in and then the mechanic reset it. He told me the diagnostic code was a result of the catalytic converter going bad. Well, the light just came back on.
2008 Nissan Sentra141,000
Check engine light, loud knocking - told it was a bad cat
2007 Nissan Sentra125,000
Check engine light came on and my mechanic reset the codes and advised me to pump premium gas for the new few fills. Did so and the check engine light stayed off for 6 months. Now its back and he is advising me about a bad cat and that I need to replace it for $850. He reset the codes and advised me to replace it the next time the check engine light comes on.
2005 Nissan Sentra119,500
Had a fuel system cleaning done which set the check engine light off. Turned out to be the front catalytic converter for precisely the reason stated. Fixed through replacement.
2010 Nissan Sentra62,572
3rd cylinder bad. Had to have entire engine replaced. Nissan refused any help because it was out if warranty at 60,000.
2006 Nissan Sentra59,645
Code p 420 service engine soon
2008 Nissan Sentra114,500
Intermittent check engine light. Dealer and alt repair shop advised bad cat. Took to a third shop for full breakdown of exhaust system and found cat split at the welds. Mechanic quote, "Robot did not have its coffee that day". Replaced at cost of 983.00. Core sent back to Nissan or would be charged another 140.00.
2008 Nissan Sentra145,350
I am about to go on a 2,000 mile road trip and this is come on. I passed emissions today but gave the the Catalytic Converter error message. I am getting checked out tomorrow by the dealership and I hope I do not have to replace anything.
2005 Nissan Sentra110,000
The car, a 2005 Sentra SER Spec V with a manual transmission, developed an exhaust rattle at deceleration as if sand were shaken in a tin can (A.K.A. The Death Rattle). The car went from absolutely no oil consumption to one quart every thousand miles. Removed the manifold and found the catalytic disc inside had disintegrated. Gutted the catalytic convertor, vacuumed sand from the head pipe and reassembled. The car still consumes oil and has a Service Engine Light sensing a faulty Pre-Cat. I had assumed this was not an issue with this car because Nissan claimed it had corrected the faulty cat which plagued the earlier models. This car had the reprogrammed ECU recall done at 50,000 miles by the dealer years ago, but I suspect damage to the catalytic convertor had already done and took 60,000 miles to manifest. Given that this engine is in many models, I believe the cars with manual transmissions (Spec-V option), are more prone to this issue because of increased exhaust backpressure upon deceleration than an automatic transmission car which would typically shift to a higher gear at deceleration.
2003 Nissan Sentra99,000
Check Engine Light Code P420. Mechanic indicates to replace the catalytic converter first. Decision pending.
2000 Nissan Sentra144,000
Check engine light, Due to Failure of Catalytic Converter to Cylinder Head. Cause to miss fire.
2009 Nissan Sentra120,000
Replaced Catalytic Converter
Could it be the mass air flow sencor again
2000 Nissan Sentra114,000
Nissan senta 2000 po171 bank 1leak
2008 Nissan Sentra110,000
Catalytic Converter failure
2008 Nissan Sentra140,000
I was told that the CO2 sensor is either broken or just malfunctioning, but my service engine soon light keeps coming on and off.
2008 Nissan Sentra142,500
Check engine light came on while driving--took to dealership and was told the catalytic converter needed replaced for around $950
The engine service soon light went on 3 days ago so I took my car to the dealer so they told me the catalytic must be replace.
2002 Nissan Sentra123,000
Car runs fine but the "service engine soon" light came on that the repair shop said the codes showed a bad CC. We hope that's all that is wrong!
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