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 Jeep Grand Cherokee Starting Issue with P1391 Code - Intermittent Cranking and Engine Stutter
I own a 1996 Jeep Grand Cherokee with a 6-cylinder engine, 115,000 miles, and an automatic transmission. Recently, I've been experiencing intermittent starting problems. The veh...
1996 Jeep Grand Cherokee | P1391Missfire Code P0303 on 1998 Ford Ranger 4.0L V6 - Diagnosis and Fix
I own a 1998 Ford Ranger XLT with a 4.0L engine (not SOHC), approximately 161,000 miles, 4x4 configuration, and 5-speed automatic transmission. A few months ago, during cold st...
98 ford ranger | P03002000 Honda Civic SI P0132 and P0133: Aftermarket Header & O2 Sensor Issues
I own a 2000 Honda Civic SI and have recently been experiencing persistent O2 sensor fault codes P0132 and P0133. I've already replaced the front oxygen sensor three times, and ...
2000 Civic SI | P0132P0172 OBD2 Code in Toyota Celica GTS with VVTL-I Engine: Causes, Fixes & DIY Diagnosis Tips
Hi everyone, I recently purchased a 2005-2010 Toyota Celica GTS equipped with the VVTL-I engine and have been experiencing recurring check engine light issues, currently showin...
Toyota Celica | P01721996 Chevy Tahoe P0172 and P0175 Codes: Diagnosing Rich Fuel Mix After O2 Sensor and Fuel Regulator Repairs
The check engine light has been intermittently on for several months on my 1996 Chevrolet Tahoe. I've taken the vehicle to both a local gas station and a Chevy dealership, where...
96 Chevy Tahoe | P01721999 Mazda 626 PO171 and PO420: Engine Shakes at Idle, Smoke from Intake?
I recently encountered a persistent issue with my 1999 Mazda 626 2.0L engine. The OBD-II scanner consistently detects fault codes PO171 (System Lean Malfunction) and PO421 (Dies...
99 mazda 626 | P0421P0170 OBD2 Fault on 2001 Vauxhall Corsa: MAF Sensor Replacement Caused Driving Issues - Fix and Lessons Learned
Hello, I own a 2001 Vauxhall Corsa and recently encountered a persistent OBD2 fault code P0170, indicating an issue with the fuel trim system. The check engine light (MIL) acti...
UNKNOWN | P01702000 Nissan Sentra GXE 1.8L P0420 Code: Misfire Damage to Catalytic Converter and Repair Recommendations
I'm experiencing a P0420 code on my 2000 Nissan Sentra GXE with the 1.8-liter engine. The issue appears to be related to a misfire that has potentially damaged the three-way cat...
Nissan Sentra GXE 2000 | P0420P0340 on a 2000 Dodge Neon
Bought the car Brand New in 2000. Had regular service (oil change, tires, spark plugs, wires, brakes, ect...No major problems. It has 135,XXX on it now. Get in the car the other...
2000 Dodge Neon | P03401997 Pontiac Grand Prix 3800 Engine Code P144- EVAP System Flow During Non-Purge - Diagnosis & Fix Guide
Hi everyone, I recently joined this forum because I deeply love my 1997 Pontiac Grand Prix SE with the 3800 engine, but I'm currently facing serious issues that need urgent att...
1997 Pontiac Grand Prix | P1441p1689 on 2001 dodge 3500 5.9 diesel
anybody have any ideas on this code or what it means
2001 dodge 3500 | P16892005 Ford F-150 Power Loss and Unusual Codes P0300, P0171, P0174, P2196, P2198 After Cold Air Kit Installation
My friend recently asked me to check the engine codes on his 2005 Ford F-150, as it has started exhibiting poor performance and lack of power. The diagnostic scan revealed sever...
05 F-150 | P01712004 Dodge Caravan P0406 Diagnostic Guide: What It Means and How to Fix It
Hi there! I recently received a P0406 trouble code on my 2004 Dodge Grand Caravan. Can someone explain what this code means and what steps are needed to resolve it? Thank you fo...
2004 Dodge Caravan | P04061998 Chevy/Geo Metro 1.0L 3-Cylinder with Persistent PO171 Code: No MAF Sensor, No Vacuum Leaks - How to Diagnose and Fix
I'm at my wit's end with my 1998 Chevrolet/Geo Metro equipped with a 1.0L 3-cylinder engine and 5-speed manual transmission. The vehicle is throwing a persistent PO171 diagnosti...
98 chevrolet geo metro 1.0L | P0171P0301 Fault Diagnosis: 2000 Nissan Sentra GXE 1.8L Engine Misfire Solution
Hi everyone, I'm experiencing a misfire on cylinder 1 in my 2000 Nissan Sentra GXE with a 1.8-liter engine, currently at around 100,000 miles. The car runs but lacks power and ...
2000 Nissan Sentra GXE 1.8 Liter | P0301Practical 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.