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.
Persistent O2 Sensor Fault Codes P0135, P0147, P0155 on 1999 Cadillac DeVille - Inspection Failure in NY State
I brought my 1999 Cadillac DeVille in for a check engine light diagnosis. A GM-certified mechanic replaced three of the four oxygen (O2) sensors, at a cost of approximately $700...
Cadillac DeVille | P21772005 Pathfinder P0345 Code: Cam Position Sensor Circuit Malfunction After Replacement
I own a 2005 Nissan Pathfinder that is experiencing misfiring, sudden VDC shutdown during acceleration, and occasional engine stalling while running. The vehicle is currently di...
Pathfinder | P03402000 Chevy Silverado 5.3L P0300 Misfire Detected but No Performance Issues - Diagnosis and Fixes
My 2000 Chevrolet Silverado with a 5.3L V8 engine is throwing a P0300 misfire code, yet the vehicle runs smoothly under normal conditions. The dealer drove it for 5 miles with a...
2000 Chevy Silverado | P03002003 Dodge Ram 1500 P0300 Random Misfire: Diagnosis and Fixes After Plug & Wire Replacement
Hi everyone, new member here — straight to the point. I own a 2003 Dodge Ram 1500 with the 5.7L Hemi engine. I've had this truck for about a year with no issues until recently. ...
2003 Dodge Ram 1500 | P03002003 Honda CRV P0420 Fault: Catalytic Converter Issue and Engine Hesitation Symptoms
Hello, I own a 2003 Honda CRV with the i-Tech 2.4L DOHC engine. Over the past few months, my check engine light has been flashing on and off. When I had a friend scan the vehicl...
2003 Honda CRV | P04202000 Chevrolet Express 1500 Cargo Van P0507 Fault Code - Diagnosis and Help
Hello everyone! This is my first time posting on the forum, so I'll try to be as detailed and clear as possible. I'm working with my dad's 2000 Chevrolet Express 1500 cargo van...
2000 chevrolet express 1500 cargo van | P05072004 Mazda 3 Check Engine Light: Codes P2178 and P2404 Explained
My check engine light came on recently but has since turned off and hasn't come back on. I've been able to retrieve two diagnostic trouble codes from my 2004 Mazda 3: P2178 and ...
04 Mazda 3 | P2178P0740 Fault Code in 2002 Chrysler Town & Country: Is a New Torque Converter Worth It?
Hello! We recently took our 2002 Chrysler Town & Country to AAMCO for service, where they identified a check engine light with fault code P0740 — Torque Converter Clutch Circuit...
2002 Chrysler Town & Country | P0740P0170 on 2000 Subaru Outback happens only after refueling
2000 Subaru Legacy Outback, 2.5L boxer engine, auto-trans. Just turned 100K miles a few days ago. I have been getting the P0170 code and the closest commonality I can determine ...
2000 Subaru Outback | P01701999 Mazda B4000 2WD - P0174 and P0304 Error Codes: Causes, Diagnosis & Fixes
Hi everyone, I'm having trouble with my 1999 Mazda B4000 2WD. After scanning the engine, I've received two diagnostic trouble codes: P0174 (System running lean in Bank 2) and P0...
1999 mazda b4000 2wd | P01741999 Toyota Camry P0125 Code: Thermostat vs O2 Sensor Diagnosis - Closed Loop Control Issues
I own a 1999 Toyota Camry with a 2.2L engine and AC (CE model, automatic transmission). After purchasing OBDWIZ software to clear diagnostic codes, I attempted a smog test but f...
99 Toyota Camry | P0125How to Clear Ford F150 P1000 OBD-II Code: Testing Incomplete Issue Resolution
My 2003 Ford F150 HD with a 5.4L engine is displaying OBD-II diagnostic code P1000, which indicates 'Testing Incomplete'. I'm looking for reliable guidance on how to properly cl...
ford | P1000Nissan Xterra 2000 P0325 Knock Sensor Issue: Intake Plenum Reinstallation Advice
Hello everyone, I'm experiencing a P0325 knock sensor fault on my 2000 Nissan Xterra. The issue appears to be related to the placement of the knock sensor — some sources suggest...
Nissan Xterra 2000 | P0325Practical 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.