P1991 Oldsmobile Delta OBD Code

OBD/2 P1991 error code description and symptoms.

Output Shaft Speed sensor circuit intermittent failure The output shaft speed sensor signal to the PCM is irregular or interrupted.
Harness connector not properly seated Harness intermittently shorted, or open Harness connector damaged OSS sensor damaged, or not installed properly Verify harness and connector integrity Verify OSS sensor proper installation.

At this point we are assuming that the fuses and relays are good. You will need to locate the PCM/TCM and the power input signal circuit using your vehicle information source. Unplug the connector from the PCM/TCM, place the ignition switch in the ON position, and probe the appropriate circuit with the positive test lead of the DVOM.

P1991 Oldsmobile Delta Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine P1991 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If secondary air injection system switching valve a circuit malfunction so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the secondary air injection system switching valve a circuit malfunction.

Difficulty Level (Easy)

Repair Time (20 Min.)

Cost Prediction : $ 30-110

Common Causes of Oldsmobile Delta P1991 OBD2 Code

A common cause of code P1991 is the failure of Secondary Air Injection System Switching Valve A Circuit Malfunction, but there are several other possible causes as well, such as ;

• Camshaft Position Sensor harness is open or shorted
• Faulty Air Flow Meter
• Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
• Camshaft advance mechanism binding (VCT unit)

P1991 is a kind of Powertrain Trouble Code Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

P1991 code for other Oldsmobile cars

You can view according P1991 DTC for your car model. We selected several models to see obd2 solutions click and view it.

• P1991 Oldsmobile 442
• P1991 Oldsmobile 4-4-2
• P1991 Oldsmobile 66
• P1991 Oldsmobile 76
• P1991 Oldsmobile 88
• P1991 Oldsmobile 98
• P1991 Oldsmobile Achieva
• P1991 Oldsmobile Aerotech
• P1991 Oldsmobile Alero
• P1991 Oldsmobile Anthem
• P1991 Oldsmobile Aurora
• P1991 Oldsmobile Bravada
• P1991 Oldsmobile Curved Dash
• P1991 Oldsmobile Custom
• P1991 Oldsmobile Custom Cruiser
• P1991 Oldsmobile Cutlass
• P1991 Oldsmobile Delmont
• P1991 Oldsmobile Eight
• P1991 Oldsmobile Eighty-eight
• P1991 Oldsmobile F-85
• P1991 Oldsmobile Incas
• P1991 Oldsmobile Intrigue
• P1991 Oldsmobile Intrique
• P1991 Oldsmobile Jetfire
• P1991 Oldsmobile Lss
• P1991 Oldsmobile Ninety-eight
• P1991 Oldsmobile O4
• P1991 Oldsmobile Omega
• P1991 Oldsmobile Profile
• P1991 Oldsmobile Recon
• P1991 Oldsmobile Silhouette
• P1991 Oldsmobile Six
• P1991 Oldsmobile Ss
• P1991 Oldsmobile Starfire
• P1991 Oldsmobile Toronado
• P1991 Oldsmobile Trofeo
• P1991 Oldsmobile Vista Cruiser

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