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.
97 Ford F150 4.6L Engine Fault Codes P1151, P0115, P0141, P0155 - Diagnosis & Fixes
My 1997 Ford F150 with a 4.6L engine is running smoothly and has reached 105,000 miles. After replacing the EGR valve and upstream O2 sensor, I'm now seeing these diagnostic tro...
97 F150 | P011597 VW Jetta P0422 and P0440 Codes: Causes and Solutions After Front O2 Sensor Replacement
I recently replaced the front oxygen sensor on my 1997 VW Jetta with 170,000 miles. Since the replacement, my fuel efficiency has remained strong at around 30 mpg, but I've noti...
97 VW Jetta | P0422P1781 Diagnostic Code on 2001 Chevrolet Heavy Duty with Duramax and Allison Transmission
The check engine light is intermittently triggering on my 2001 Chevrolet Heavy Duty equipped with a Duramax diesel engine and an Allison transmission. The P1781 fault code has b...
2001 Chev Heavyduty | P1781PO430 DTC in 1996 Mercury Sable: Causes and Solutions for Catalyst System Efficiency Below Threshold
This is my first post, and I'm hoping someone can help. My mother has a 1996 Mercury Sable that she brought in recently because it started missing and surging while driving on t...
Mercury Sable | P0430PO300 Fault in 1996 Chevy Blazer 4x4 with 126K Miles - Heater Core or Engine Misfire?
Hello! We've been detecting a strong engine coolant odor in the passenger cabin, which has led us to suspect a failing heater core. However, we have not observed any visible flu...
1996 Chevy Blazer 4 x 4 | P0300P0171 Fault Code on 1998 Plymouth Breeze: Causes and Solutions for Lean Mixture & Idle Issues
I'm experiencing an engine check light on my 1998 Plymouth Breeze with a 2.4L engine. The diagnostic trouble code (DTC) is P0171, indicating a lean air-fuel mixture. I've read o...
Plymouth Breeze | P0171P0336 Fault Code in 1999 Oldsmobile Intrigue: Causes and Solutions
I've been experiencing intermittent stalling in my 1999 Oldsmobile Intrigue for the past four months. The vehicle either loses power for a brief second before recovering, or it ...
1999 Oldsmobile Intrigue | P03362000 Isuzu Rodeo Check Engine Light Returns with Code PO42-0: Causes and Solutions
My 2000 Isuzu Rodeo experienced a blown engine, which was replaced with a used engine having 40,000 miles. The installation was performed by an unqualified mechanic. Upon pickup...
2000 Isuzu Rodeo | P04201999 Chevrolet 5.7L Engine P0300 Multiple Cylinder Misfire Diagnosis and Fixes
I'm experiencing a persistent P0300 fault code on my 1999 Chevrolet 5.7L V8 engine. The vehicle shows multiple cylinder misfires, especially when idling or accelerating between ...
1999 CHEVROLET | P03001998 Ford F150 V8 4.6L - P0121 and P0174 Fault Codes: Diagnosis and Fix
I'm experiencing two OBD-II fault codes on my 1998 Ford F150 with a 4.6L V8 engine: P0121 (Throttle Position Sensor Range/Performance) and P0174 (System Too Lean - Bank 2). I've...
98 Ford F150 | P012101 Chevy Astro po300
I'm having trouble with an 01 Astro 4.3 rwd, 147k. Was running rough and died. towed to shop. There were several codes stored, po101b, p300b,p0351, po404b, p1381c. Found severa...
Chevy Astro | P03002000 Chevy Silverado 1500 5.3L: P0430, P0157, and P0300 Fault Codes - Diagnosis and Fixes
Hi everyone, I'm looking for help with my 2000 Chevrolet Silverado 1500 4x4 5.3L engine. After replacing the catalytic converter due to a P0430 code, I started seeing P0157 (O2 ...
00 Chevy | P01571996 Nissan Sentra OBD P0500 and P0400 Codes: Causes, Fixes, and Smog Test Solutions
I'm facing two OBD-II diagnostic codes—P0500 and P0400—on my 1996 Nissan Sentra while preparing for an annual smog test. My mechanic claims only the dealership can fix these iss...
1996 nissan sentra | P0400P0300 Fault in 1996 Chrysler Sebring LXi: Misfire Not Present, Brake Light Switch or PCM Issue?
Hi everyone, I recently encountered a P0300 diagnostic code on my 1996 Chrysler Sebring LXi. After consulting with Kirkland Chrysler Jeep, I learned that the P0300 code was not...
1996 Chrysler Sebring LXi | P0300P0340 Fault on 2003 Jeep Grand Cherokee Laredo 4.1L V6: Causes, Diagnosis & Fixes
I'm experiencing a P0340 camshaft position sensor circuit fault on my 2003 Jeep Grand Cherokee Laredo with the 4.1L straight-6 engine. The vehicle won't start on the first attem...
2003 Jeep Grand Cherokee Laredo 4.1L Straight 6 | P03401999 Toyota RX300 Check Engine Codes P1153 and P1155 - Causes and DIY Fix Guide
I'm experiencing two OBD-II diagnostic codes on my 1999 Toyota RX300: P1153 (Air/Fuel Ratio Sensor Circuit Response Malfunction - Bank 2 Sensor 1) and P1155 (Air/Fuel Ratio Sens...
1999 RX300 | P1153Practical 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.