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.
OBD II P0121 Code on 4.0L Jeep Wrangler: TP Sensor vs MAP Sensor Mismatch After Off-Road Driving
I'm experiencing an intermittent OBD II P0121 code on my 4.0L Jeep Wrangler, which indicates a disagreement between the Throttle Position (TP) sensor and the Manifold Absolute P...
4.0 L Jeep Wrangler | P01212002 Jeep XTerra P0328 and P0306 Error Codes After Car Wash or Rain - Water Intrusion Suspected
I'm experiencing a strange issue with my 2002 Jeep XTerra. After passing through a car wash or exposure to heavy rain, the vehicle runs roughly and triggers error codes P0328 an...
2002 XTerra | P03282004 Audi A4 Quattro P0741 Code: Diagnosis and Fix Guide
I'm looking for help diagnosing and fixing the P0741 code on my daughter's 2004 Audi A4 Cabriolet Quattro. The Check Engine Light has activated multiple times, each time trigger...
2004 Audi A4 Quattro | P0741P0302 Diagnostic: 2003 Toyota Tacoma 4Cyl 2.4L - Misfire in Cylinder #2 with Intermittent Code Set
2003 Toyota Tacoma, 4-cylinder, 2.4L engine, regular cab, 2WD, automatic transmission, 196,000 miles. The P0302 diagnostic trouble code appears intermittently — sometimes setti...
Cyl #2 | P03021996 Toyota Corolla P0302 Misfire: Diagnosis and Solutions After Replacing Spark Plugs, Injectors, and Ignition Components
I've been consistently receiving the P0302 diagnostic trouble code indicating a misfire in cylinder 2 on my 1996 Toyota Corolla 1.6L automatic model. Despite replacing spark plu...
1996 Toyota Corolla | P0302Lexus RX 300 P1354 Code and Misfire Solutions: Common Causes and Fixes
I've seen numerous posts with the same symptoms I'm experiencing, but no definitive solutions. It's frustrating—after researching everything possible, once a problem is fixed, p...
Lexus RX 300 | P1354P0420 Fault on 2001 Chevrolet Cavalier 2.2L - Diagnosis and Next Steps
Hi, I own a 2001 Chevrolet Cavalier with a 2.2L engine, automatic transmission, and currently at 109,000 miles. A few months ago, I experienced a random misfire (likely P0300) a...
2001 Chev Cavalier 2.2 | P04202003 Hyundai Sonata P0120 Code: Recurring TPS Issue After Restart
I'm experiencing a recurring P0120 throttle position sensor (TPS) fault in my 2003 Hyundai Sonata. The car runs smoothly on the first start of the day, even after long drives. H...
03 Hyundai Sonata | P0120P0130 Fault on 2001 Skoda Fabia 1.4 Petrol - O2 Sensor Heater Issue & Emission Test Anomalies
We are experiencing a recurring P0130 fault on a 2001 Skoda Fabia 1.4 petrol model with approximately 97,000 km. The issue first appeared after refueling with questionable fuel,...
fabia 2001 1.4 petrol | P0130P0420 Fault Diagnosis for 2000 Mercury Cougar V6 - Catalyst System Efficiency Below Threshold Bank 1
My 2000 Mercury Cougar V6 has the check engine light illuminated, and my OBD-II scanner displays fault code P0420 (Catalyst System Efficiency Below Threshold - Bank 1). I am con...
2000 Mercury Cougar | P04202001 Pontiac Grand Am GT P0135 Fault Code: Diagnosis and PCM Programming Costs
I'm currently experiencing the same issue with my 2000 Chevrolet Impala, and I'm considering replacing the Powertrain Control Module (PCM) to resolve the P0135 fault code. Befor...
2001 Pontiac Grand Am GT | P01352003 Ford Mustang Mach 1 P0301 P0303 P0305 P0420 P0430 Diagnosis and Repair Guide
Seeking help with recurring misfire and catalytic converter issues on a 2003 Ford Mustang Mach 1 4.6L DOHC V8 engine. Fault codes detected: - P0301: Cylinder 1 Misfire Detected...
2003 Mustang Mach 1 | P0301Mazda BT50 Turbo Diesel 2007 P0402 P0404 P2263 Fault Diagnosis and EGR Sensor Issues
I own a 2007 Mazda BT50 Turbo Diesel with 70,000 miles. After scanning the vehicle, I found three persistent fault codes: P0402 (EGR excessive flow at idle), P0403 (#2 EGR solen...
MAZDA BT50/FORD RANGER | P0402P0308 Fault in 2005 Jeep Grand Cherokee 4.7L After Overheating and Engine Misfire
Hello, I own a 2005 Jeep Grand Cherokee Limited with a 4.7L engine and over 229,000 miles. Recently, I checked my coolant level and failed to tighten the reservoir cap properly,...
2005 Jeep Grand Cherokee 4.7L | P0308BMW E46 M3 P1115 Coolant Temperature Sensor Plausibility Error - Diagnosis and Fixes
I'm currently receiving the P1115 diagnostic code on my BMW 2001 E46 M3, which indicates a 'coolant temperature sensor plausibility' fault. I've already replaced both the coolan...
BMW 2001 M3 | P11152005 Dodge Grand Caravan P0032: Heater Control Circuit High Bank 1 Sensor 1 - O2 Sensor Replacement Not Resolving Issue
I recently encountered a check engine light with code P0032 — Heater Control Circuit High Bank 1 Sensor 1 on my 2005 Dodge Grand Caravan with a 3.8L engine. I was advised that t...
2005 dodge grand caravan | P00322002 Monte Carlo SS P0300 Code: Engine Stalls at Wide Open Throttle, Fuel Pressure Normal
I own a 2002 Monte Carlo SS with a 3.8L V6 and automatic transmission. I'm currently receiving a P0300 random misfire code. When the vehicle is in park, pushing the gas pedal to...
2002 Monte Carlo | 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.