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.
P0420 Fault on 2005 Honda Odyssey (41,000 Miles) - Causes and Repair Solutions
I recently purchased a used 2005 Honda Odyssey with only 41,000 miles. Shortly after driving it off the lot, the check engine light activated. Using my Actron PocketScan, I retr...
2005 Honda Odyssey | P0420Saturn L200 2.2L Ecotech Engine: P0420 and P0170 Codes After Cat Replacement
I own a 2003-2005 Saturn L200 with the 2.2L 4-cylinder Ecotech engine. I recently replaced the original catalytic converter, which had become plugged, with a new unit from CATCO...
Saturn L200 | P0172P0402 Fault Code in 1995 Ford T-Bird: Diagnosis and EGR Location Guide
I'm experiencing a P0402 diagnostic trouble code on my 1995 Ford T-Bird. What should I check, and where is the EGR valve located? The P0402 code indicates a malfunction in the e...
95 T-Bird | P0402P1744 Diagnostic Code on 1998 Ford Escort with Automatic Transmission: Solenoid or Torque Converter Issue?
My daughter drives a 1998 Ford Escort with a 2.0L engine and automatic transmission. She recently received trouble code P1744, indicating a 'torque converter clutch solenoid mal...
98 Escort | P174498 Toyota Sonoma 2.2L Catalytic Converter Differential Temperature Normal Range and Diagnosis
I have a 1998 Toyota Sonoma with a 2.2L engine. What should the normal differential temperature be between the catalytic converter inlet and outlet? After a 45-minute drive home...
Cat | P04202000 Camaro V6 3.8L - P0137 O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) After Catalytic Converter Replacement
I own a 2000 Chevrolet Camaro with a 3.8L V6 engine and recently encountered a diagnostic trouble code: P0420 Catalyst System Efficiency Below Threshold (Bank 1). As a result, I...
2000 Camaro | P013797 Nissan Maxima P0446, P0325, P044- How to Fix These Codes on a Budget?
My Check Engine Light came on yesterday, and after taking the car to Advance Auto for code reading, I received three trouble codes: P0446, P0325, and P0440. The service technici...
97 Nissan Maxima | P03251999 Mercury Villager P0340 Code: No Camshaft Position Sensor? It's Actually in the Distributor!
I'm really frustrated! I've been getting a P0340 diagnostic code indicating a camshaft position sensor issue, but when I ask dealerships or parts stores for this component, they...
99 Mercury Villager | P03402000 Ford Ranger 3.0L V6 Flex Fuel P0402 Code: EGR Flow Excessive Diagnosis and Fix
I recently replaced the DPFE (Differential Pressure Feedback Emission) sensor on my 2000 Ford Ranger 3.0L V6 flex-fuel engine about two months ago. The replacement cleared the P...
2000 Ford Ranger v6 3.0 flex | P0402P0300 Fault Diagnosis for 1998 Chevy K1500 4.3L V6 - Misfire at High Speeds
I own a 1998 Chevrolet K15-00 with a 4.3L V6 engine and am currently experiencing a noticeable hesitation or misfire when cruising above 65 mph. The vehicle runs smoothly at low...
1998 Chevy K1500 4.3 V6 | P0300P1399 Fault Code on 2000 Honda Prelude - Solutions After EGR Valve Replacement and Cleaning
Hi, I own a 2000 Honda Prelude and am currently experiencing a P1399 diagnostic trouble code. I've already replaced the EGR valve and cleaned carbon buildup from the EGR valve a...
honda prelude | P139903 town and country code p0301
Hey guys Please I need some help 03 town and country with code p0301 misfire cyl #1 Ok this is what I've done: brand new mopar spark plugs wires, New spark plugs, still misfires...
03 Town and Country | P0301P0743 and P0307 Codes - 1999 Dodge 25-00 Van 318 5.7L V8: Misfire and Transmission Issues Explained
I own a 1999 Dodge 2500 van with a 318 5.7L V8 engine. The vehicle runs fine on highways for up to 40 miles, but I notice occasional bucking—especially when driving at lower spe...
99 Dodge 2500 van 318 5.7 V8 | P030798 Bonneville P0300
Thanks to the other poster I am working on a 98 Bonneville. OBD2 code is P0300 and P 0121 code( bad O2 sensor). Changed O2 sensor and code does not reappear. After new wires ...
98 Bonneville | 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.