Bentley Arnage Pre Cat Lambda Sensor Oxygen Sensor PB20364PA
Description
Is your Bentley Arnage or Rolls Royce Silver Seraph showing a check engine light? Are you experiencing poor fuel economy, rough idling, or sluggish acceleration? These are the most common symptoms of a failing upstream oxygen sensor — and this genuine OEM replacement part number PB20364PA is the correct fix for early Bentley Arnage and Rolls Royce Silver Seraph models.
The upstream oxygen sensor — also known as the pre-catalytic converter sensor or lambda probe control — is one of the most critical components in your engine management system. Positioned before the catalytic converter, it continuously monitors the oxygen content in the exhaust gases and sends real time data to the engine control unit. The ECU uses this information to precisely adjust the air to fuel ratio for optimal engine performance, fuel efficiency and emissions control.
How it works: The upstream sensor generates a voltage signal that fluctuates between rich and lean as the engine management system fine tunes the fuel mixture. When the sensor ages or fails, it produces a slow or inaccurate signal — causing the ECU to make incorrect fuel adjustments. This results in the symptoms owners notice most: poor gas mileage, rough running, failed emissions tests and an illuminated check engine light with oxygen sensor related fault codes.
Symptoms of a failing upstream oxygen sensor: Check engine light illuminated with fault codes P0130, P0131, P0132, P0133 or similar oxygen sensor codes, noticeably worse fuel economy, rough idle or hesitation during acceleration, strong smell of fuel from the exhaust, black smoke from the exhaust, failed state emissions inspection.
Important — two sensors required per car: The Bentley Arnage and Rolls Royce Silver Seraph V8 engine uses two upstream oxygen sensors — one for each bank of the engine. This listing is for one sensor sold individually. We strongly recommend ordering both sensors at the same time to ensure balanced engine performance and avoid a second check engine light appearing shortly after the first repair. Call us at +1 845 595 9822 and we will confirm exactly what you need.
Important — upstream sensor only: This is the upstream pre-catalytic converter sensor part number PB20364PA only. This is not the downstream post-catalytic converter sensor. Please confirm which sensor you need before ordering or call us and we will identify the correct sensor from your VIN number and fault codes.
Full fitment — confirmed from Bentley Heritage Parts Catalogue: Bentley Arnage 1998-2000, Bentley Arnage Green Label, Bentley Arnage 4.4L Birkin, Rolls Royce Silver Seraph all variants, Rolls Royce Silver Seraph LoL, Rolls Royce Park Ward from chassis 07501.
VIN verification strongly recommended before ordering. Call our Bentley and Rolls Royce specialists at +1 845 595 9822 seven days a week. In stock and ships fast from our New York warehouse.