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.
1999 Dodge Grand Caravan P0401 and P0403 Fault Diagnosis: EGR Valve Location and Repair Guide
The check engine light is on, and the vehicle has diagnostic codes P0401 (EGR System Efficiency Below Threshold) and P0403 (EGR Flow Control Malfunction). Based on my research, ...
99 Dodge Grand Caravan | P04011999 Ram 3500 Van P0505 Code: Diagnosis and Fix for Persistent Check Engine Light
I own a 1999 Ram 3500 van with a 360 engine and approximately 65,000 miles. I'm currently experiencing the persistent P0505 trouble code, which triggers a constant check engine ...
99 ram 3500 van | P0505P0172 Diagnostic and Fix for 2004 Chevrolet Envoy: Spark Plugs, O2 Sensors, and Catalytic Converter Issues
I'm experiencing a P0172 code on my 2004 Chevrolet Envoy, which indicates a lean fuel mixture in Bank 1. After multiple troubleshooting attempts, I've found that this issue is o...
04 Envoy | P01722001 Nissan Sentra XE 1.8L P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2) - Diagnosis and Fix Guide
I'm experiencing a recurring P0430 fault code on my 2001 Nissan Sentra XE 1.8L, indicating 'Catalyst System Efficiency Below Threshold (Bank 2)'. My friend has an OBD-II scanner...
2001 Nissan Sentra XE 1.8L | P04302002 Toyota Intrepid P0344 Code: What It Means and How to Fix It
Fault Code: P0344 The P0344 diagnostic trouble code appears in 2002 Toyota Intrepid vehicles and indicates a problem with the Camshaft Position Sensor A Circuit. This code is t...
2002 Intrepid | P03442001 Chevy Suburban P0174 P0300 P0420 Codes: Causes, Fixes & Diagnosis Guide
Hello, I own a 2001 Chevrolet Suburban with the Check Engine Light illuminated. After taking it to AutoZone, I received five diagnostic codes: two P0174 codes (Bank 1 and Bank 2...
2001 Chevy Suburban | P01741996 Saturn Transmission Codes P0731-P0734: Causes and Fixes for Gear Ratio Errors
I own a 1996 Saturn that is displaying transmission fault codes P0731, P0732, P0733, and P0734. These codes indicate issues with gear ratio sensing in the transmission. While I'...
1996 SATURN | P07311998 Chevrolet Grand Prix P0507 Code: Idle Control System RPM Higher Than Expected
I'm experiencing a P0507 diagnostic trouble code on my 1998 Chevrolet Grand Prix, which indicates the Idle Air Control (IAC) system is not maintaining an appropriate idle speed....
98 Grand Prix | P05072002 Dodge Ram 1500 4.7L Engine Won't Start with P0725 Code - Diagnosis and Fix
My 2002 Dodge Ram 1500 with a 4.7L V8 engine won't start. The engine does not turn over, even though I've installed a brand new battery. There's no clicking sound from the start...
02 dodge ram 1500 | P072599 Tahoe Rough Idle with DTC 171 and 1133 - Troubleshooting Guide
Jeff, after over six years of moderating automotive forums, I've learned that no matter how clearly we explain technical issues, some users struggle with reading, communication,...
99 Tahoe | P1133PO171 System Too Lean Diagnosis - 2002 Chevrolet Cavalier 2.2L Engine
2002 Chevrolet Cavalier with a 2.2L 4-cylinder engine, currently at 100,102 miles. My girlfriend's car just passed the 100,000-mile mark last week and suddenly stalled about on...
2002 Chevrolet Cavalier | P0171P0446 Code 01 & 02 on 1998 GMC S10 4.3L Engine - Evaporative Emission System Issue
I have a 1998 GMC S10 with a 4.3-liter engine and the check engine light has come on. The diagnostic trouble codes detected are P0446-01 and P0440-02. Generic code description...
1998 S10 | P0446PO300 Fault Diagnosis: 2001 Ford Windstar 3.8L Engine Misfire Solutions
I'm experiencing a persistent PO300 fault on my 2001 Ford Windstar with a 3.8L engine. Yesterday, the vehicle displayed both PO301 and PO302 codes, accompanied by a blinking che...
2001 Ford Windstar | P030097 Concorde 3.5 code P0340 & various misfire codes
Out of the blue my Concorde will not start. It never hesitated, no Check Engine light...it always ran beautifully. Now it just turns over and will not fire. My first though...
97 Concorde | P0340P1167 Fault Code on 2000 Honda Accord: Front O2 Sensor Heating Circuit Issue
I recently purchased a 2000 Honda Accord with just under 100,000 miles, bought used about a year ago at approximately 82,000 miles. Last week, the Check Engine Light (CEL) came ...
2000 Honda Accord | P1167PO301 Fault Code with 2002 Dodge Intrepid 2.7L: Low Compression, Valve or Piston Ring Issues?
I recently received a PO301 diagnostic trouble code on my 2002 Dodge Intrepid equipped with the 2.7L 6-cylinder engine (the smaller of the two available variants). The vehicle h...
Intrepid | P0300P1144 Fault Diagnosis and Repair for 2001 Volkswagen Jetta TDI
I own a 2001 Volkswagen Jetta 1.9T DDI and am currently experiencing a P1144 diagnostic trouble code, which indicates either an open or short to ground in the Mass Airflow (MAF)...
01 Jetta TDI | P1144P0302 and P0325 Fault Diagnosis: 1997 Nissan Pathfinder V6 with Warm-Start Misfire
Vehicle: 1997 Nissan Pathfinder (4WD, 3.3L V6, automatic transmission, A/C), 162,000 miles Diagnostic Codes: P0302 (cylinder #2 misfire) and P0325 (knock sensor fault) Issue D...
1997 Nissan Pathfinder | P0302Practical 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.