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.
1997 Nissan Quest 6-Cylinder P0135 and P0325 O2 Sensor & Knock Sensor Issues
I own a 1997 Nissan Quest with a 6-cylinder engine. I recently encountered persistent fault codes P0135 (O2 Sensor Circuit Slow Response) and P0325 (Knock Sensor Circuit). I rep...
97 Nissan Quest | P01352003 Saturn Vue P0440 OBD2 Code: Cost, Repair Kit & Trusted Mechanic in Fall Church, VA
I recently noticed the Engine Code light on my 2003 Saturn Vue. I took it to a mechanic since there are no local Saturn dealers available. The technician mentioned that the P044...
Saturn SUV | P04402003 Pontiac Montana AWD 3.4L - P0300, P0302/P0303 & P0440 Code: Misfire and Evaporative Emissions Issue at 104k Miles
2003 Pontiac Montana AWD with a 3.4L engine, currently at 104,000 miles. Recently experienced consistent P0300 (Random Misfire), along with intermittent P0302 and P0303 codes. ...
2003 Pontiac Montana AWD | P03001997 Ford F-150 4.6L Engine P0308 Missfire: Diagnosis & Fixes After Rebuild (Non-COP Ignition)
My father-in-law owns a 1997 Ford F-150 with the 4.6L VIN W engine (non-COP ignition system), currently at 188,000 miles on the vehicle and only 1,000 miles on the engine. After...
97 F150 | P03081997 Dodge Dakota P0172: Fuel Trim Issues and Root Cause Analysis
My 1997 Dodge Dakota with a 318 engine is showing a P0172 fault code, indicating Bank 1 fuel trim is too rich. I've already replaced both O2 sensors and am using an Actron scann...
97 Dakota | P017298 Sunfire 2.2 p0420
Odometer 205,000km Cat. less than a year old. Down stream O2 sensor 1 year old. Added 1 cup methyl hydrate to a full tank of gas Week later, tank almost empty, i'm getting the ...
98 Sunfire | P04201997 Nissan Quest P0135 O2 Sensor Heater Circuit Fault - Bank 1 Sensor 1
My 1997 Nissan Quest has a 6-cylinder engine. The vehicle is showing fault code P0135, which indicates an issue with the oxygen sensor heater circuit for Bank 1, Sensor 1 — loca...
97 Nissan Quest | P01352000 Taurus FFV P0411 Code: Diagnosis and AIR Pump Troubleshooting Guide
I'm experiencing a recurring P0411 diagnostic trouble code on my 2000 Ford Taurus FFV. Despite limited information online, I've been trying to diagnose the root cause of this is...
2000 Taurus | P0411Nissan Sentra P0420 and P0430 Codes: Causes, Fixes, and Underlying Issues for 2001 4-Cylinder Models
I own a 2001 Nissan Sentra XE with 125,000 miles. Within the past year, I replaced both the upstream and downstream catalytic converters. Recently, my vehicle has triggered a P0...
Sentra | P04202001 Lexus RX300 P0171 Lean Bank 1: Diagnosis and Fixes for Poor Fuel Economy & Rough Idle
I own a 2001 Lexus RX300 with 150,000 miles. The check engine light and VSC warning light have been on for an extended period. The vehicle has generally run well until recently....
2001 Lexus RX300 | P01712002 Ford F-150 P0171 and P0174 Lean Mixtures: Diagnosis and Fixes for Both Banks
Yesterday my 2002 Ford F-150 was throwing trouble codes P0171 (lean mixture in bank 1) and P0174 (lean mixture in bank 2), followed by a persistent misfire in cylinder 7 (code P...
2002 f-150 | P0171P1300 Fault Code on 1999 VW Beetle 2.0 AEG: Misfire Diagnosis and Solutions
I recently encountered the P1300 diagnostic code for the first time on my 1999 Volkswagen Beetle with a 2.0L AEG engine. According to the code description, it indicates a misfir...
1300 | P130096 Jeep GC 5.2L Engine O2 Sensor Codes P0132-P0141: Diagnosis and Wiring Access Solutions
Hi there, I recently performed exhaust work on my 1996 Jeep GC with a 5.2L engine, which required removing the exhaust system. After reassembly and starting the engine, I began ...
96 Jeep GC | P01322002 Jaguar S-Type OBD-II Code P0065: Causes and Solutions for Engine Misfire on Hills
I own a 2002 Jaguar S-Type with a 4.0L V8 engine, and I'm currently experiencing a P0065 diagnostic trouble code. The vehicle exhibits noticeable misfiring when climbing hills. ...
2002 Jaguar S Type | P00652001 Mercedes CLK320 P0301 Random Misfire with P136 and P156 Error Codes - Troubleshooting Guide
I'm experiencing a random misfire indicated by fault code P0301 on my 2001 Mercedes CLK320, along with freeze frame data errors P136 and P156. I'm looking for advice on the best...
2001 mercedes clk320 | P03011998 Hyundai Accent 6 Cylinder OBD2 Error Codes: PO421, PO712, PO732, PO733, PO734, PO-740 - Emission Test Fix & Repair Costs
I own a 1998 Hyundai Accent GL with an automatic 4-cylinder engine. I need to pass a state emission test and have been diagnosed with six OBD2 check engine codes from AutoZone: ...
98 hyundai accent | P21772004 Jeep Grand Cherokee Overland P0841 Code: Causes and Diagnosis After Cold Morning Start
I'm experiencing a P0841 diagnostic trouble code on my 2004 Jeep Grand Cherokee Overland, specifically after a cold morning start. The issue appears to be related to the transmi...
04 Grand Cherokee Overland | P08411998 Chevrolet C2500 5.7L Engine Racing at High RPMs with Air Leak Symptoms
I'm seeking urgent advice on my 1998 Chevrolet C2500 5.7L V8 engine, which is currently running at excessively high RPMs and producing a noticeable air leak sound. The engine id...
1998 chev P/U c2500 | C2500Practical 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.