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 GMC Express Van Dead Battery Every Morning with P0101 Code - How to Fix and Diagnose?
I own a 2002 GMC Express Van with 130,000 miles and a 4.3L engine. The vehicle has been experiencing a recurring issue: the battery dies completely every morning. After charging...
2002 GMC Express Van | P01011996 Ford F-150 4.9L Engine P0171 and P017-than Codes - Emissions Test Failure
Hi, I own a 1996 Ford F-150 with a 4.9L inline-six engine, automatic transmission, 2WD, and dual fuel tanks. The truck runs smoothly under normal conditions, but it consistently...
96 F150 | P0171OBD Codes 22, 33, 35, 45 - How to Fix for 1991 Pontiac Sunbird GT 3.1L
Hi there! I'm looking for help diagnosing and fixing OBD II fault codes 22, 33, 35, and 45 on my 1991 Pontiac Sunbird GT with a 3.1L engine. The car is non-carbureted and has be...
1991 Pontiac Sunbird | P0220codes P0300 and P0449 03 chevy venture
2003 chevy venture. My problem started over a month ago, I was driving up a hill and the van shut off as if i turned the key off, once I pulled over it started right back up. A ...
03 chevy venture | P03002002 Passat V6 P0171 O2 Sensor Code: Lean Condition Diagnosis and Fixes
Vehicle: 2002 Volkswagen Passat, 2.8L V6 engine, 175,000 miles. Owned since new with all scheduled maintenance performed. The vehicle has been showing O2 sensor-related trouble...
Passat | P0171P0332 Fault Code on 2002 Chevrolet Suburban 5.3L: Diagnosis Without Removing Intake Manifold
I own a 2002 Chevrolet Suburban with a 5.3L FlexFuel engine. The vehicle has been in excellent condition and runs smoothly. Last night, the 'Service Engine Soon' light activated...
Suburban 5.3L | P03322005 Ford Expedition P0174 and P0304: Lean Condition and Cylinder 4 Misfire Diagnosis
I own a 2005 Ford Expedition XLT and am experiencing intermittent stalling during acceleration. The check engine light recently came on, and after checking at Autozone, I found ...
2005 Ford Expedition | P01741998 Mazda 1.5L After EGR Valve Cleaning: Now Shows P0400, P0120, and P0505 Codes
I have a 1998 Mazda 1.5L that previously showed a P0400 code due to restricted EGR flow. After cleaning the EGR valve and throttle body and reassembling, the vehicle now exhibit...
1998 Mazda 1.5L | P0120OBD2 Code P0601 in 1999 Dodge Durango: Causes and Fixes
I own a 1999 Dodge Durango and recently received OBD2 diagnostic code P0601. Has anyone else experienced this issue? What are the common causes, and is there a reliable solution...
99 dodge durango | P06012004 Mercury Sable P0300 Multiple Misfire: Check Engine Light Flashes and Engine Stalls
I own a 2004 Mercury Sable and am experiencing recurring issues with the check engine light that comes on and off intermittently. A diagnostic scan shows a consistent P0300 code...
2004 Mercury Sable | P03002001 Lincoln Town Car Running Rich - Check Engine Light On with Fuel Cap Code
I own a 2001 Lincoln Town Car that is running rich in both Bank 1 and Bank 2. The check engine light is currently on, specifically indicating a fuel cap issue. I have already re...
Lincoln Town Car | P21772008 GMC Envoy P0121 and P2135 Codes: Understanding the Difference and Warranty Coverage
I own a 2008 GMC Envoy experiencing accelerator hesitation, accompanied by the P0121 diagnostic trouble code. GM has issued Special Coverage Bulletin #11273, which may cover thi...
2008 GMC Envoy | P0121Kia Pride 2007 P0011 Fault Code: How to Diagnose and Fix OCV Issue
Kia Pride 2007 with fault code P0011 - This code indicates an Over-Flow Control Valve (OCV) issue. I've already checked the engine oil level and the OCV lines, but the problem p...
kia pride | P00112008 Hyundai Santa Fe P0026 P0012 P0011 Fault Codes at 135,000 Miles - Oil System and Sensor Issues
I own a 2008 Hyundai Santa Fe with 135,000 miles. The vehicle is displaying persistent fault codes P0026, P0012, and P0011 on my OBD2 scanner. I've already replaced the oil and ...
2008 Hyundai Santa Fe | P00112002 VW Golf P0102 Code: Mass or Volume Air Flow Sensor Circuit Low - Location and Fix Guide
I recently received a P0102 diagnostic code on my 2002 Volkswagen Golf 4-door, indicating a 'Mass or Volume Air Flow A Circuit Low' issue. I'd like to know the exact location of...
2002 VW Golf | P01022009 Saturn Vue 2.4L P0010 Fault Code: Diagnosis and Repair Guide
Hello, I own a 2009 Saturn Vue XE with a 2.4L 4-cylinder engine and has reached 115,000 miles. The check engine light came on, and after taking it to AutoZone, I was given the P...
2009 Saturn Vue | P00101997 Honda Accord 4-Cylinder Check Engine Light & OBD II Code P0720: Transmission Sensor Issue and Repair Cost Guide (California Bay Area)
1997 Honda Accord Special Edition (4-cylinder) - While driving on the freeway, the "Check Engine" light activated. A diagnostic at a quality tune-up revealed OBD II Code P0720. ...
1997 HONDA ACCORD | P07202004 Jeep Grand Cherokee P0440 Code: Causes, Symptoms & Solutions for Intermittent EVAP System Issues
I recently purchased a 2004 Jeep Grand Cherokee in 2007 and have been experiencing an intermittent Check Engine Light issue linked to code P0440. The problem started shortly aft...
2004 Jeep Grand Cherokee | P04402007 Hyundai Optra P0300 P0444 P0700 P0722 P1403 - How to Fix All OBD2 Error Codes
I have owned my 2007 Hyundai Optra for the past nine months, and recently it has started displaying several OBD2 diagnostic trouble codes when scanned using an OBD-Scan tool. Th...
2007 Optra | 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.