Traditional gasoline car fault
Search fault code and browse forum case posts.
This page is designed for quick diagnosis on gasoline vehicles by combining code lookup with real discussion cases. Enter a fault code to filter related topics, then compare symptom context such as cold start behavior, acceleration load, fuel-trim deviation, ignition misfire pattern, and recent maintenance history. Many codes can be triggered by shared root causes, so use cross-checks from multiple posts before replacing sensors, coils, injectors, or catalytic components.
1996 Neon P0300 OBD2 Code: After Replacing Plugs, Coils, Sensors Still Dies on Highway
I own a 1996 Neon with a 2.0L SOHC engine and automatic transmission. It has been experiencing intermittent stalling for nearly three months. I've replaced multiple components i...
96 neon | P0300Dodge Ram 1500 1996 P0171 Fault Code: Lean Mix Issue & Diagnosis Tips
I own a 1996 Dodge Ram 1500 with a 5.9L V8 engine, 4-wheel drive, and over 150,000 miles. The check engine light is on, and I've received diagnostic code P0171, which indicates ...
1996 Dodge Ram 1500 | P0171P0446 and P0401 Fault Codes on 2001 Hyundai XG 3L V6 - Causes and Solutions
I'm seeking clarity on two intermittent fault codes appearing on my 2001 Hyundai XG with a 3.0L V6 engine and electronic 5-speed automatic transmission. The first issue is a rec...
Hyundai | P04012001 Dodge Stratus R/T Won't Start with P0335 and P0455 Codes - No Click, Only Fuel Pump Sound
My 2001 Dodge Stratus R/T with a 3.0L Mitsubishi V6 engine and 5-speed manual transmission was running fine until I went into the store. When I returned, the car would not start...
Car | P0335P0300 & P0301 Fault Diagnosis: 2001 Ford Protege LX 2.0L Engine Idle Issues
Hi everyone, I've been experiencing intermittent Check Engine Light (CEL) activation on my 2001 Ford Protege LX 2.0L, which comes on and off every few days—sometimes staying on ...
Protege 2001 LX 2.0L | P03002007 Chevrolet Monte Carlo P2138 Fault Code: Service Stability System & Engine Power Reduced
I've recently started experiencing the 'Service Stability System' message, which is immediately followed by 'Engine Power Reduced.' After connecting my vehicle to an OBD2 scanne...
2007 Monte Carlo | P21382006 Ford Taurus SE P0302 Fault: Diagnosis and Next Steps
I have a 2006 Ford Taurus SE with a 3.0L engine and automatic transmission. The OBD2 scanner detects fault code P0302, indicating a misfire in cylinder #2. When I remove the spa...
06 ford taurus | P0302P0420 Error in 2004 Ford Taurus SE: Catalytic Converter or Dirty O2 Sensors?
I own a 2004 Ford Taurus SE sedan and am currently experiencing a check-engine light. The diagnostic trouble code displayed is P0420. Attached is the full OBD-II data for refer...
Taurus | P04202002 Dodge Dakota P0442 and P0445 Fault - EVAP System Issues
Hello, I'm new to this forum and have done a search but couldn't find any posts addressing my specific issue. When coasting in a parking lot at speeds below 15 MPH, my 2002 Dodg...
2002 Dodge Dakota | P0442Ford Excursion P0720 Code: Engine Dies in Gear or Idle - Diagnosis and Fix
My Ford Excursion is showing a P0720 diagnostic code. I recently followed the recommendation from Ford service to replace the spark plugs, but the issue persists. The engine sta...
Ford Excursion | P07201997 GMC Astro P0101 OBD2 Code: No Start Issue with Fuel Smell and Block Heater Solution
Hello everyone, I'm writing about my 1997 GMC Astro passenger van, which has accumulated 290,000 kilometers of service. The vehicle is a 2-wheel-drive model with minimal option...
1997 Astro | P0101P0306 Fault Code on 2004 Grand Am - Cylinder 6 Too Lean After Fuel Run-Out
My 2004 Grand Am won't start after running out of fuel. Once fuel was added, the engine started but with a persistent P0306 diagnostic code indicating cylinder 6 is too lean. I ...
04 Grand Am | P0306P0133 and P0139 OBD2 Codes in 2001 Kia Optima: Diagnosis and Repair Tips
Hi, I'm new to car diagnostics but am desperate for a solution. I have a 2001 Kia Optima, and every time the check engine light comes on, I get codes P0133 and P0-139. The vehic...
Kia Optima | P01332004 Mazda MPV P0131 OBD Code: Identifying and Replacing the Vacuum Hose Behind the Engine
My 2004 Mazda MPV is showing a P0131 OBD-II diagnostic code. I've noticed a vacuum leak coming from a large hose located behind and at the top of the engine. Can anyone confirm ...
2004 Mazda MPV | P0131P0141 O2 Sensor Code on 1996 Honda Accord V6: Causes, Fixes & EGR Flow Connection
I've been experiencing a persistent P0141 O2 sensor code on my 1996 Honda Accord V6. After replacing the upstream oxygen sensor (located just before the catalytic converter), th...
1996 Honda Accord V6 | P01412003 Silverado EVAP System Codes P0443, P0449, P0455 - Purge Valve Replacement Not Resolving Issue
I'm currently working on a 2003 Chevrolet Silverado with a 5.3L V8 engine. The vehicle is throwing EVAP system fault codes: P0443, P0449, and P045-5. I was advised that the issu...
03' Silverado | P21772000 Nissan Sentra P0446 and P0304: EVAP Vent Circuit Malfunction and Cylinder 4 Misfire Diagnosis
I'm reaching out for some help regarding a 2000 Nissan Sentra my parents own. The vehicle is currently displaying two trouble codes: P0446 (Evaporative Emission Control System V...
2000 Nissan Sentra | P0304Practical workflow for fault-code troubleshooting
Start by confirming battery voltage and reading freeze-frame data, then inspect wiring and connectors before replacing parts. If the code returns after clearing, record the exact driving or idling condition when it reappears. Prefer case threads with complete repair feedback, because confirmed outcomes provide stronger guidance than one-time symptom descriptions. Following a step-by-step workflow reduces repeated repairs and lowers total diagnosis time.