Traditional gasoline car fault

2000 Honda Civic EX stalling after new catalytic converter

My daughter's 2000 Civic (88K) died on her last fall only months after we bought it. We had it towed and looked at. The mechanic said that it needed a major tune up as it looked...

2000 Honda Civic EX | P0420

1997 Chevrolet Lumina 3.1L - P0300, P0420, and Pending P0300: Overheating & Coolant Leak Diagnosis

I recently purchased a 1997 Chevrolet Lumina with a 3.1L engine. The car has been experiencing intermittent overheating, requiring coolant top-up every 4-5 days. Once the coolan...

97 Chev Lumina | P0300

P0420 Code Explanation and Diagnosis for 2003 Honda S2000 with New Catalytic Converter

I recently installed a new catalytic converter and mufflers on my 2003 Honda S2000, both completed in early this week. On Sunday afternoon, the check engine light activated. I t...

2003 Honda S2000 | P0420

Toyota corolla 2001 with code P0420

Hi I have a corolla 2001 with 140,000 miles on it. i am getting error code P0420, last year i have changes to O2 sensor (bank 1) and MAF sensor. I went to mechanic and tested it...

Toyota Corolla | P0420

P0420, P0430, P1351 Fault Codes on 1997 Chevrolet Silverado 5.7L V8 - Diagnosis and Fixes

The fault codes P0420 (Catalyst System Efficiency Below Threshold), P0430 (Catalyst System Efficiency Below Threshold Bank 2), and P1351 (Oxygen Sensor Circuit Malfunction) on a...

97 Chevy Silverado 5.7L | P0420

1996 gmc safari p0420 p0300 po131 p0151 p0172 decel misfire

I've replaced the EGR valve, all 4 O2 sensors, plugs, wires, cap&rotorX3. Now that I've got your curiosity - Here's our story - i've had this wonderful 213k mile 96 awd gmc saf...

1996 gmc safari | P0151

P0420 Code in 2001 Nissan Altima SE 2.4L: Is the Coolant Temperature Sensor Faulty?

I own a 2001 Nissan Altima SE with a 2.4L engine, currently at just under 110,000 miles. Recently, my vehicle triggered a P042-0 diagnostic trouble code, indicating catalytic co...

Unknown | P0420

2001 Toyota 4Runner (P0770 and P0420

2001 Toyota 4Runner with 197K miles. Had O2 sensor replaced 14 months ago. History of situation: 1. Check Engine Light on for at least 4 months. 2. Went to get inspection 2 wee...

2001 Toyota 4Runner | P0420

2001 Ford Taurus P0301 and P0420: Diagnosing Misfire and Catalytic Converter Efficiency Issues

I recently purchased a 2001 Ford Taurus with a 3.0L OHV engine (non-flex-fuel). The vehicle has approximately 188,000 miles on the odometer, and I have limited knowledge of its ...

2001 Taurus | P0301

Volkswagen Jetta 2002 P0420 Code: Causes, Symptoms, and Fixes - Diagnosing Catalytic Converter Issues

Hi everyone, this is my first post on the forum — I'm hoping for some guidance with a recurring issue on my 2002 Volkswagen Jetta 2.0L engine. Recently, I've been getting error ...

Volkswagen Jetta | P0420

1996 Toyota Camry P0420 Code: Is It Related to Griffin iTrip Device?

Hello everyone, I'm currently troubleshooting my 1996 Toyota Camry that has triggered a Check Engine Light and displayed Diagnostic Trouble Code P0420 — Catalyst Efficiency Belo...

96 Toyota Camry | P0420

2000 Toyota Camry OBD Code P0401 and P0402: EGR Flow Issues and Rough Idling Solutions

My 2000 Toyota Camry is showing OBD codes P0401 (EGR Insufficient Flow) and P0402 (EGR Excessive Flow). The vehicle exhibits rough idling, loss of power, sputtering, and increas...

2000 Toyota Camry | P0420

P0420 Fault Diagnosis for 1997 Toyota Camry with 138,000 Miles

Hello. My check engine light came on recently, so I purchased a code reader to diagnose the issue. The device detected a P0420 fault code. Here's some background: I bought this ...

1997 Toyota Camry | P0420

1996 Dodge Grand Caravan P0420: Catalytic Converter Failure & Fuel Trim Issue After Repair

I own a 1996 Dodge Grand Caravan with a 3.3L engine, automatic transmission, and approximately 135,000 miles. I recently encountered the P0420 diagnostic trouble code (DTC), ind...

1996 Dodge Grand Caravan | P0420

P0420 Fault Code Explanation and O2 Sensor Voltage Testing for 2000 Honda Odyssey

I own a 2000 Honda Odyssey and am seeking accurate voltage range information for both the front and rear oxygen (O2) sensors. Specifically, I need to know the expected test volt...

Honda Odyssey | P0420

P0420 Fault Code: Diagnosis and Fixes for 1999 Subaru Legacy 2.2L

My 1999 Subaru Legacy 2.2L has been experiencing a loss of power, sluggish acceleration, and significantly reduced fuel efficiency—dropping from my usual 27 mpg to only 22 mpg. ...

1999 Subaru Legacy 2.2L | P0420

2005 Subaru Forester P0420 Code

My wife has an 05 Forester with 62k miles on it. Recently the Check Engine Light came on. I checked the gas cap, filled her up with gas,and went for a drive and the light was ...

2005 Subaru Forester | P0420