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.
2003 Ford Expedition PO171 PO174 P2195 P2197 - Rough Idle and Check Engine Light
Yesterday my 2003 Ford Expedition's check engine light came on. The vehicle runs roughly and erratically at idle, as if it's struggling to find the correct idle speed. It perfor...
2003 Ford Expedition | P21951999 Kia Sephia P1500, P0732, P0733, P0734 Error Codes Persist After Sensor Replacement
I'm seeking help from experienced Kia owners. I've recently replaced both the Input Speed Sensor (VSS) and Output Speed Sensor on my 1999 Kia Sephia. Despite these replacements,...
99 Kia Sephia | P07321999 Jeep Grand Cherokee P0720 Fault: How to Fix Speed Sensor Issue?
I'm experiencing a P0720 trouble code on my 1999 Jeep Grand Cherokee. This model has a speed sensor located in the rear wheel anti-lock brake system, and I've been trying to res...
1999 Jeep Grand Cherokee | P07202000 Honda Odyssey P0420 and P1149 Fault Code Fix - Cheap DIY Solution for 175,000-Mile Van
My 2000 Honda Odyssey has reached 175,000 miles and I'm looking to sell it without spending much on repairs. The check engine light is coming on due to fault codes P0420 and P11...
2000 Honda Odyssey | P11492000 Honda Isuzu Rodeo with P1441, P1290, and P0300 Codes: Diagnosis and Catalytic Converter Vibration Issues
Hello everyone — this is my first post on the forum. I've seen similar codes in other threads, but I'm hoping to get insight into whether these issues are related. I recently p...
2000 Honda Isuzu Rodeo | P03002000 Camaro V6 P0102 MAF Sensor Low Input Issue - Car Dies at Idle, Sputters on Throttle
I own a 2000 Chevrolet Camaro V6 3.8L and recently picked up the diagnostic code P0102 — Mass Air Flow (MAF) Circuit Low Input. This issue began after previously having only int...
2000 Camaro V6 | P01022001 Toyota Corolla (CA model) P0171: Fixing Hesitation and Emissions Failure with MAF Sensor and Air Intake Diagnosis
This is my first post on the forum, but I've relied heavily on these discussions for troubleshooting. My girlfriend recently moved to Phoenix from California with her 2001 Toyot...
2001 Toyota Corolla (CA model) | P01712004 chev impala p0300 code
When the engine is warm it starts to run rough and I get a burning smell. It will stall when the accelerator is released. I took off the exhaust and ran the car fine for abou...
2004 chev impala | P03001999 Dodge Ram 1500 Magnum 318 Engine P0305 Misfire Only on Startup
I've been troubleshooting this issue for years on my 1999 Dodge Ram 1500 with the Magnum 318 V8 engine. The problem occurs only when starting the truck: it runs roughly for up t...
99 Dodge Ram V8 Magnum 318 | P03052001 MPV P0421 Fault: Does It Require a Catalyst Converter or Oxygen Sensors?
I'm experiencing a P0421 diagnostic code on my 2001 MPV. Does this indicate the need for a catalytic converter replacement or faulty oxygen sensors? Any guidance on troubleshoot...
2001 MPV | P04211999 Chevrolet Corvette P0137 and P0157 - Emissions Test Failure Diagnosis
My girlfriend recently had her 1999 Chevrolet Corvette tested for emissions, and it failed due to O2 sensor fault codes P0137 and P0157 — indicating low voltage in the downstrea...
1999 Corvette | P01371997 Pontiac Bonneville Won't Start with P0300 Code: Fuel, Spark, and Coolant Issues
My wife's 1997 Pontiac Bonneville will not start. The starter engages and turns the engine smoothly, but there is no consistent combustion sound—only a constant cranking noise. ...
1997 Pontiac Bonneville | P03001996 Nissan Maxima P0115 and P0125 Codes: Causes and Repair Solutions
Can anyone help identify the cause of P0115 and P0125 error codes in my 1996 Nissan Maxima with a 6-cylinder engine? I'm planning to perform the repairs myself and would appreci...
96 nissan maxima | P0115Mazda Protege 2000 ES P0421 Code: How to Pass Inspection Without a $700 Converter?
Hi everyone, I've had the Engine Check Light on for about a year. The day before my state inspection, I had someone else reset the codes. The next day, I failed the inspection ...
Mazda Protege | P04212003 Honda Civic SI P0420 Code: Causes, Repair Needed, and Long-Term Damage?
My 2003 Honda Civic SI is frequently throwing a P0420 diagnostic trouble code. It recently passed its emissions test in May 2008 and runs smoothly under normal conditions. I'm c...
2003 Honda Civic Sir | P0420P0304 Diagnosis for 1999 Chevy Silverado with 5.3L Engine: How to Fix Misfire on Cylinder 4
I own a 1999 Chevrolet Silverado equipped with a 5.3-liter V8 engine and am currently experiencing the P0304 diagnostic trouble code, indicating a misfire in cylinder #4. I've a...
1999 Chevy Silverado | P0304Practical 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.