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.
2002 Ford F150 V6 Misfire and EGR Code Troubleshooting: P1400, Cyl 3 Misfire, and EGR Flow Issues
I own a 2002 Ford F150 V6 with 52,000 miles. The truck has been exhibiting persistent misfire issues, specifically cylinder 3 misfire and 'misfire in first 1000 revolutions' cod...
Ford F150 | P0300Code P0170 1997 Nissan Maxima GXE
Hello all. I have a 97 Maxima GXE, auto, no ABS. Recently the car threw a code while I was out of town. The Nissan code 0115 which converts to P0170 which is fuel system too lea...
1997 Nissan Maxima GXE | P01702001 Chevy Cavalier P0440 EVAP Code CHECK ENGINE...HELP!
We have a 2001 Chevy Cavalier with 2.2liter that we just bought used. It was sold because the neighbor girl said Autozone said it needed a $300 EVAP part. Here is where we are.....
2001 Chevy Cavalier | P04401996 Ford Taurus P0135, P0141, P0155, P0161 and P0174 Fault Codes: Causes, Sensor Locations & Fixes
I own a 1996 Ford Taurus with approximately 140,000 miles. Recently, my vehicle has triggered several OBD2 diagnostic codes: P0135, P0141, P0155, P0161, and most recently P0174....
Ford Taurus | P01352000 VW Passat P1177 Code: Emissions Workshop Light On, O2 Sensor Issues & Recall Fix
The check engine light has come on this week on my 2000 VW Passat. The car runs smoothly under normal conditions, but during initial acceleration, the dashboard displays 'EMISSI...
2000 VW Passat | P1177P0420 Fault on 1997 Taurus SHO: Catalytic Converter Issue and O2 Sensor Diagnosis
I'm experiencing a recurring P0420 fault on my 1997 Taurus SHO. The check engine light has cleared on its own and remained off for approximately two weeks before reappearing. I'...
Sho | P04202000 Toyota Tacoma PO420 Code: Catalyst System Malfunction After Cat and O2 Sensor Replacement
Hi, I own a 2000 Toyota Tacoma that has been throwing up a PO420 diagnostic code (Catalyst System Efficiency Below Threshold - Bank 1). I've already replaced both the catalytic ...
2000 Toyota Tacoma | P04201998 VW Cabrio P0102 Code: Diagnosis and Solutions for MAF Sensor Issues
I'm experiencing a persistent P0102 code on my 1998 VW Cabrio, and despite multiple troubleshooting steps, the issue remains unresolved. I've cleaned the Mass Airflow (MAF) sens...
1998 VW Cabrio | P0102Toyota RAV4 1999 - P0401 and P1133 Fault Codes: Diagnosis and Solutions
My 1999 Toyota RAV4 has the check engine light on, with fault codes P0401 and P1135. I understand that P1133 refers to the oxygen sensor (O2) for Bank 1 Sensor 1, but my Haynes ...
Toyota RAV4 | P04011997 Mitsubishi Galant P0505 Code: Idle Problems and IAC Valve/Motor Diagnosis
Hi there, I own a 1997 Mitsubishi Galant that has been experiencing idle instability at low RPMs and when the vehicle is completely stopped. The car runs fine on highways, but ...
1997 mitsubishi galant | P05052003 Dodge Ram 1500 4.7L V8 Engine Fault Code PO441: Causes and Solutions
I've had no issues with my 2003 Dodge Ram 1500 4.7L V8 before, but recently it started showing a diagnostic trouble code (DTC) PO441. The only maintenance performed in the past ...
2003 Dodge Ram 1500 4.7 L V-8 | P04412002 Chevrolet Trailblazer P0440 and P0420 Codes: EVAP System Leak & Catalytic Converter Issue - How to Fix?
I've been researching this forum for months trying to resolve a persistent issue with my 2002 Chevrolet Trailblazer V6 Vortec (103,000 miles, well-maintained). I'm a female owne...
2002 Trailblazer | P04202000 Acura Integra P0420 Code: Universal vs. Direct Fit Catalytic Converter & Oxygen Sensor Diagnosis
I own a 2000 Acura Integra GS with 65,235 miles and an automatic transmission. One morning, I noticed a severe rattling noise when starting the car. The shop diagnosed a failing...
2000 Integra | P04202000 Chevrolet Silverado PO300 Code: Rough Idle and Check Engine Light - How to Diagnose and Fix
Hello again, I recently inspected my 2000 Chevrolet Silverado last month, and it ran smoothly at the time. However, currently, the truck starts roughly and runs unevenly with t...
2000 chevrolet silverado | P0300Practical 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.