Sensor Problems Analysis Cases

Comprehensive analysis of automotive sensor failures including oxygen sensors, temperature sensors, and more.

2001 Hyundai Accent Hard Start and Rough Idle Diagnosis
2001 Hyundai Accent
The owner reports that the 2001 Hyundai Accent has difficulty starting and exhibits a rough idle when cold. The problem occurs primarily in the mornin...
Hyundai Accent MAF Sensor
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Toyota Sienna P0116 Code Diagnosis and Repair
2000 Toyota Sienna
The owner reports a P0116 code for their 2000 Toyota Sienna at 119,000 miles. The code indicates a coolant temperature sensor circuit range/performanc...
Toyota Sienna P0116
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2001 Lincoln Town Car Engine Hesitation at 40-45 mph
2001 Lincoln Town Car
The owner reports that the 2001 Lincoln Town Car's engine hesitates or misfires specifically at speeds between 40 and 45 mph. The issue arises only du...
Lincoln Town Car Engine Hesitation
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1995 Toyota Truck 22RE Oxygen Sensor Diagnostics
1995 Toyota Truck
The owner recently purchased a 1995 Toyota Truck with a 22RE engine and 105,000 miles. The check engine light has been illuminated since the previous ...
Toyota Oxygen Sensor 22RE Engine
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2000 Toyota 4Runner Running Rough After Sensor Replacement
2000 Toyota 4Runner
The owner reports that their 2000 Toyota 4Runner with a 3.4L V6 engine is running rough, especially when warmed up. The check engine light was on, and...
Toyota 4Runner running rough
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Eagle Vision Intermittent Starting Problem Diagnosis
1993 Eagle Vision
The owner reports an intermittent starting issue with their 1993 Eagle Vision (3.3L engine, approximately 97,000 miles). The engine sometimes fails to...
Eagle Vision intermittent starting
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2003 Ford F-150 EGR Valve and Lean Codes Diagnosis
2003 Ford F-150
The owner reports a 2003 Ford F-150 with a 4.6L V8 engine experiencing recurring P0171 and P0174 trouble codes. The engine idles roughly at normal tem...
Ford F-150 P0171
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Cooling Fan Not Engaging at Normal Temperatures
2012-2015 Ford Focus
The owner of a Ford Focus reports that the cooling fan is not activating as expected, particularly during idle or in traffic. Although it operates cor...
cooling_system fan_relay temperature_sensor
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1989 Toyota Corolla Cooling Fan Constantly On
1989 Toyota Corolla
The owner reports that the cooling fan is running constantly from the moment the engine starts, even when cold. Additionally, a check engine light has...
Cooling System Coolant Temperature Sensor Fan Relay
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1998 Cadillac STS Intermittent Check Engine Light Issue
1998 Cadillac STS
The owner has been experiencing an intermittent check engine light on their 1998 Cadillac STS for over a year. They report that the vehicle shows code...
Cadillac STS check engine light
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Cooling Fan Malfunction Analysis for 2005 Chevrolet Optra
2005 Chevrolet Optra
The owner of a 2005 Chevrolet Optra 1.6 A/T reports that the engine cooling fan does not operate when the AC is off. However, both fans run when the A...
cooling_system AC_system temperature_sensor
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1999 Dodge Intrepid Engine Stops Intermittently
1999 Dodge Intrepid
The owner reports that their 1999 Dodge Intrepid engine stops unexpectedly while driving. It shuts off without warning, and after replacing the ASD re...
Dodge Intrepid engine stalling
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1999 Honda Accord - Multiple Trouble Codes and Smell
1999 Honda Accord
The owner of a 1999 Honda Accord LX with a 4-cylinder manual transmission reports several trouble codes after a scan. They describe a strong acrid sme...
Honda Accord clutch
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1996 Ford Escort Electric Fan Not Working
1996 Ford Escort
The owner reports that the electric cooling fan on their 1996 Ford Escort LX 1.9L is not functioning, leading to engine overheating issues. Previous r...
Ford Escort Cooling System
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P0336 Code Diagnosis for 2003 Pontiac Bonneville
2003 Pontiac Bonneville
The owner of a 2003 Pontiac Bonneville reports a persistent P0336 code, indicating a crankshaft position sensor issue. They had the vehicle serviced a...
P0336 CKP sensor Pontiac Bonneville
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2000 GMC Jimmy Fuel Pressure and MAF Sensor Diagnostics
2000 GMC Jimmy
The owner of a 2000 GMC Jimmy is experiencing issues with fuel pressure readings at the schroeder valve, measuring 47 PSI with the key on and 50 PSI w...
fuel_system MAF_sensor diagnostics
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1999 GMC Sierra Acceleration Problems and Diagnostics
1999 GMC Sierra
The owner reports that their 1999 GMC Sierra is experiencing acceleration issues. When the gas pedal is pressed, the vehicle sputters and backfires, b...
GMC Sierra acceleration issues
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2000 Saturn LS2 Idle Issues After MAF Replacement
2000 Saturn LS2
The owner of a 2000 Saturn LS2 with a 6-cylinder engine reports intermittent low idle after replacing the mass air flow (MAF) sensor. Initially, the M...
Saturn MAF sensor idle issues
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