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Olds Aurora P0151 and P0300 Codes After Fuel Fill-Up - Diagnosis and Fix

Model: Olds Aurora Fault Code: P0151 Posted: 2008-01-19 16:39

My Olds Aurora has developed a serious issue after a recent fuel refill. Previously, the car was running fine, but after driving approximately 70 miles and refueling, I noticed that the Check Engine Light, Anti-Lock Braking System (ABS), and Traction Control lights all illuminated and remained on. Using an OBD2 scanner, I retrieved two diagnostic trouble codes: - P0151: Low voltage detected on the oxygen sensor - P0300: Random misfire detected across multiple cylinders The vehicle now runs roughly, especially at lower speeds. It can maintain speed but exhibits noticeable hesitation and roughness. Given that the car is a stock model with 108,000 miles, I’ve already replaced spark plugs, checked coil packs, and installed a new fuel pressure regulator—yet the codes persist. What could be causing this issue? Is it related to fuel quality or an underlying mechanical fault?

Related fault codes
P0151P0300
Comments (4)
Anonymous 2008-01-22 10:20

The root cause may vary depending on the vehicle's maintenance history and modifications. A thorough inspection is essential.

Anonymous 2008-01-26 18:12

The car is a stock model at 108,000 miles. I've already replaced the spark plugs, inspected all coil packs, and installed a new fuel pressure regulator—yet P0151 and P0300 persist.

Anonymous 2008-01-31 17:18

The issue was resolved by removing the fuel rail. Three out of eight injectors were severely clogged. After cleaning them with TB (Tire & Brake) cleaner, I reassembled the system and the vehicle is now running smoothly without any codes.

Anonymous 2008-02-05 08:24

Avoid refueling at that station—fuel quality may have contributed to the problem. Glad it was a straightforward fix once the root cause was identified.