Traditional gasoline car fault

1999 Honda Civic EX P0420 Code Reappears Every 5-6 Days - What Could Be Causing It?

For the past month, my check engine light has been coming on every 5 to 6 days. Each time, I take it to my mechanic who clears the code and advises me to drive hard on the highw...

1999 Honda Civic EX | P0420

2003 Honda CR-V P0420 and P0845 Codes: Voltage Fluctuations and Alternator Issues Explained

I own a 2003 Honda CR-V and have been experiencing consistent voltage fluctuations since purchasing the vehicle. The headlights frequently go from bright to dim, and this fluctu...

2003 Honda CR-V | P0420

1999 Cadillac Seville SLS P0503, P0125, P0420: Vehicle Speed Sensor vs ECT Sensor Diagnosis and Repair Cost Guide

Hello everyone, I recently purchased a 1999 Cadillac Seville SLS with the Service Engine Light illuminated. AutoZone diagnosed three trouble codes: P0503 [Vehicle Speed Sensor ...

1999 Cadillac Seville SLS | P0125

2011 Chevrolet Malibu P0014 and P0420 Codes: Camshaft Solenoid Replacement & Diesel-Like Noise Diagnosis

My 2011 Chevrolet Malibu is displaying diagnostic trouble codes P0014 and P0420. The engine makes a ticking noise at idle and sounds similar to a diesel during acceleration. Aut...

2011 Malibu | P0014

2007 Ford F15 T5.4L Supercharged with P0420 and P0430 Codes: Can an SCT Programmer Fix Exhaust Flow Issues for Inspection?

I own a 2007 Ford F-150 Nightmare with a 5.4-liter engine, Roush supercharged and modified. The vehicle has over 18,000 miles on the odometer. Prior to purchase, the original mu...

2007 F150 | P0420

1999 Mercury Grand Marquis P0420 and P0430: Lean Codes, Jerking, Stalling - Diagnosis & Fixes

My 1999 Mercury Grand Marquis has been experiencing persistent drivability issues despite having P0420 (Catalyst System Efficiency Below Threshold - Bank 1) and P0430 (Catalyst ...

99 MGM | P0420

2007 Jeep Grand Cherokee P0420 and P0430 Pending: What It Means & How to Fix It

My 2007 Jeep Grand Cherokee 3.7L engine has triggered pending codes P0420 and P0430. I'm trying to understand what these codes mean and whether they indicate a failing catalytic...

Jeep Grand Cherokee | P0420

2005 Volkswagen Beetle Won't Start After Morning Startup; Fault Codes P0321, P0170, P0420

My 2005 Volkswagen Beetle starts reliably in the morning but fails to start again afterward and only restarts after a full day has passed. The onboard diagnostic system shows th...

2005 Beetle | P0171

P0420 Fault in 2003 Chevrolet Suburban 5.3L: Diagnosis and Solutions

My check engine light activated, so I took the vehicle to AutoZome to retrieve diagnostic codes. The system displayed a repair recommendation for ECM wiring and identified code ...

2003 Chevy Suburban 5.3L | P0420

P0420 Fault on 1997 Jeep Grand Cherokee 5.2L: No Start, Full Power, and Diagnostic Code Persistence

I'm experiencing a puzzling issue with my 1997 Jeep Grand Cherokee 5.2L. The vehicle recently triggered a P0420 diagnostic code, which I had previously resolved by replacing the...

1997 Jeep Grand Cherokee 5.2L | P0420

2004 Chevy Silverado P0420 Code: How to Confirm and Fix Catalytic Converter Failure

I'm experiencing a P0420 trouble code on my 2004 Chevrolet Silverado with a 5.3L V8 engine. I suspect the catalytic converter has failed. My main questions are: how can I confir...

2004 Silverado | P0420

2009 Chevy Traverse No Power with P0050, P0420, P0100, and P0113 OBD2 Codes

My 2009 Chevrolet Traverse is experiencing complete loss of power, with a maximum speed of only 15 mph. OBD-II scan results show persistent fault codes: P0050, P0420, P0100, and...

2009 Chevy Traverse | P0050

2005 Chevrolet Malibu P0300 and P0420 Codes: Causes and Solutions at 176k Miles

I own a 2005 Chevrolet Malibu with 176,000 miles. After the engine warms up, it consistently stalls at or below 3,000 RPMs. The vehicle is showing two diagnostic trouble codes: ...

2005 Malibu | P0300

2011 Jeep Liberty P0420 Check Engine Light: Causes and Diagnosis After Water Pump Replacement

My daughter owns a 2011 Jeep Liberty with approximately 90,000 miles. Yesterday, I had the water pump replaced at a cost of $460. This morning, she called to report that the che...

2011 Jeep Liberty | P0420

P0420 Fault on 2007 Nissan Altima 3.5L 6-Cylinder: Is Cat Replacement Necessary or Are There Alternatives?

Hi everyone, I'm currently dealing with a P042

2007 Nissan Altima 3.5 6 Cyl | P0420

1991 Chevrolet C1500 5.7L Engine Codes P22, P32, and P42: Diagnosis and Fixes

I own a 1991 Chevrolet C1500 with a 5.7L V8 engine. After performing a diagnostic check, I received trouble codes P22, P32, and P42. However, different automotive websites provi...

91 Chevrolet C1500 | P0220

2002 Chevrolet Silverado P0133 then P0420 - Catalyst Efficiency Issue After O2 Sensor Replacement

My 2002 Chevrolet Silverado with a 5.3L V8 engine has reached 126,600 miles. I initially received a 'Service Engine Soon' warning light. Using an OBD2 scanner, the first fault c...

Silverado | P0133

P0171 and P0420 Diagnosis on 2007 Nissan Quest: Fuel Pump or Sensor Issue?

Hello, My check engine light came on about a month ago. I took the vehicle to Firestone for service, where they diagnosed a P0171 code. The mechanic recommended replacing both ...

2007 Nissan Quest | P0171

2007 Chevrolet Silverado P0128 P0420 P0430 B2AAA - Causes and Fixes for OBD2 Error Codes

Hello everyone, I recently noticed that my 2007 Chevrolet Silverado is experiencing a specific issue: the vehicle seems to drop in temperature when driving, and the cooling fan...

2007 Silverado | P0128

P0420 Fault Code Explanation for 2013 Ford Escape

I own a 2013 Ford Escape and have recently received a pending P0420 diagnostic trouble code. What does 'pending' mean in this context? Is it indicating that the vehicle's exhaus...

2013 Ford Escape | P0420