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.
P0133 and P0171 Diagnosis for 1999 Dodge Dakota 4x4 with 83K Miles
Hello everyone, great community here! My name is Brian, and I'm currently experiencing several issues with my 1999 Dodge Dakota. Vehicle Details: - Model: 1999 Dodge Dakota - D...
1999 Dodge Dakota | P0133P0306 Misfire Diagnosis on 1998 Toyota 4Runner V6: Causes and Fixes
My 1998 Toyota 4Runner with a 6-cylinder V6 engine is showing a P0306 diagnostic trouble code, indicating a misfire in cylinder 6. The truck runs smoothly when cold but begins t...
98 4 Runner | P03062000 Subaru Forester P0440 Code: Evaporative Emission System Issue After Gas Cap Replacement
I have a 2000 Subaru Forester that is throwing up a P0440 diagnostic code. This occurs specifically when the gas tank is filled. I've already replaced the gas cap, but I notice ...
2000 Subaru Forester | P04402004 GMC Envoy Error Code P0410: Secondary Air Injection System Malfunction Location & Diagnosis
I understand the error code P0410 indicates a 'Secondary Air Injection System Malfunction,' but I'm unsure where this system is located on my 2004 GMC Envoy. Notably, this model...
2004 Envoy | P0410OBD2 Codes P0304, P0305, P0306, and P0402 on 2001 V6 Mustang - Causes and Fixes
If the fuel filter has not been disabled, air in the fuel line could be causing these OBD2 codes. This is a common issue in 2001 V6 Mustangs with the 4.6L engine. Air intrusion ...
2001 V6 Mustang | P0304P0135 O2 Sensor Heater Circuit Malfunction in 1996 Honda Accord LX (2.2L) - Diagnosis and Repair Guide
Hi everyone, I just started my 1996 Honda Accord LX (2.2L) and noticed the check engine light was on. Using an OBD-II scanner, I retrieved fault code P013-5: 'O2 Sensor Heater ...
1996 Honda Accord LX (2.2 L) | P0135P0507 Code on 1997 Chevrolet Cavalier 2.2L - Fan-Related Issue and IAC/PCV Replacement Help
I'm experiencing a P0507 diagnostic trouble code on my 1997 Chevrolet Cavalier with a 2.2L engine. After replacing the Idle Air Control (IAC) valve and Positive Crankcase Ventil...
1997 chevrolet cavalier | P0507P0507 Code on 1997 Chevrolet Cavalier 2.2L - Fan-Only Trigger and IAC/PCV Replacement Already Done
I'm experiencing a persistent P0507 diagnostic trouble code on my 1997 Chevrolet Cavalier with a 2.2L engine. Despite replacing the Idle Air Control (IAC) valve, PCV valve, and ...
1997 chevrolet cavalier | P0507P0401 and P0403 Fault on 1999 Plymouth Voyager - EGR Circuit Failure Diagnosis
I'm facing a persistent issue with my 1999 Plymouth Voyager (150,000 miles) that has triggered the Service Engine Light and displayed both P0401 (Insufficient EGR Flow) and P040...
99 Plymouth Voyager | P040196 Dodge Ram 1500 V8 5.2L Multiple Cylinder Misfires - Fuel System & Ignition Diagnostics
My 1996 Dodge Ram 1500 with a 5.2L V8 engine is experiencing multiple cylinder misfires across all eight cylinders. I've already replaced the spark plugs, ignition wires, distri...
96 Dodge Ram 1500 | P03001999 Chevy Suburban PO405
I was wondering if anyone out there has had this problem. Mine starts with this code then runs through everything from 02 sensors to cats. The vehicle has had no ill effects. Dr...
1999 Chevy Suburban | P0405P0152, P0174, P1196 Fault Diagnosis - 2002 Dodge Dakota V6 3.9L (Bank 2 O2 Sensor Issue)
I recently purchased a 2002 Dodge Dakota with a 3.9L V6 engine and experienced significant off-road damage during a 4x4 outing last week. Shortly after, my vehicle began display...
2002 Dodge Dakota | P01521996 Dodge Ram 1500 5.2L Engine PO171 Code: Diagnosis and O2 Sensor Voltage Guide
I'm experiencing a recurring PO171 code on my 1996 Dodge Ram 1500 with the 5.2L V8 engine. The code clears quickly after resetting, suggesting an intermittent issue. I've identi...
1996 dodge truck 5.2l | P0171P0404 2005 Dodge Ram 1500 Error Code
Came in last night from the holiday travel and right after I filled up full of gas on my way to the house I got the check engine light on with the P0404 error code. I have rese...
2005 Dodge Ram 1500 | P0404obd2 codes p0304, p0305, p0306, and p0402 on 2001 v6 mustang
I am recieving these codes and was wondering if anyone could maybe tell me why im recieving these codes!! any help would be greatly appreciated! i know what the codes stand for ...
2001 V6 Mustang | P03041999 Mazda 626 P0171 Code: Fix for Lean Mixture Bank 1 Due to EGR Valve Gummy Deposits
I've been troubleshooting this issue for a while — my 1999 Mazda 626 is showing a P0171 code indicating a lean mixture in bank 1. I started by cleaning the MAF sensor, which was...
1999 mazda 626 | P017198 Ford F150 P0171 and P0174 Codes: Causes, Fixes, and Common Solutions
I'm experiencing P0171 and P0174 diagnostic trouble codes on my 1998 Ford F150 with a 4.6L engine and 150,000 miles. I've already replaced both oxygen (O2) sensors, changed the ...
98 F150 | P01711996 Dodge Grand Caravan P0420: Catalytic Converter Failure & Fuel Trim Issue After Repair
I own a 1996 Dodge Grand Caravan with a 3.3L engine, automatic transmission, and approximately 135,000 miles. I recently encountered the P0420 diagnostic trouble code (DTC), ind...
1996 Dodge Grand Caravan | P0420Practical 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.