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ACDELCO 2131299 Specifications
Wire Quantity3
Connector GenderFemale
Connector ShapeRadiused Polygon
Length11.00 (IN)
Wire Harness Length8.39 (IN)
Mounting TypeThreaded
Sensor TypeHeated
Wire Gauge Measurement20
Gold / Professional
An ACDelco Professional, premium aftermarket Oxygen (O2) Sensor is the ideal high quality replacement for your GM vehicle. It is a special feedback sensor on your vehicle's exhaust system. This sensor measures the proportion of oxygen in the exhaust gases. Using this measurement, the engine management computer can adjust the air/fuel ratio near the optimum value of 14.7:1. At this ratio, engine performance, emissions, and fuel economy are all optimized. This premium aftermarket replacement oxygen sensor is manufactured to meet or exceed your expectations for fit, form, and function.

Features & Benefits:
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
  • Coverage available for GM and non-GM applications
  • Professional, premium aftermarket replacement
  • Provides the performance and dependability you expect from ACDelco
  • Manufactured to meet expectations for fit, form, and function
Engine Bank Identification

An OBD Scan Tool will usually identify Oxygen (O2) Sensors by the Bank Number (B1 = Bank 1; B2 = Bank 2) and Sensor Number (S1 = Sensor 1; S2 = Sensor 2, etc.). Bank 1 is not on the same side of the engine for every vehicle.

  • Bank 1 will always contain Cylinder 1. To locate Cylinder 1,
    • Check for cylinder labels on spark plug wires
    • Look for the cylinder that is closest to the front of the engine
    • Refer to your Repair Manual (Found under 'Literature')
  • Bank 2 refers to the bank opposite Bank 1
  • Sensor 1 refers to the sensor before the catalytic converter
    • Other Common Terms: Upstream Sensor, Pre-Cat Sensor
  • Sensor 2+ typically refers to the sensor(s) after the catalytic converter
    • Other Common Terms: Downstream Sensor, Post-Cat Sensor
Engine Bank Identification Engine Bank Identification
Common O2 Sensor Locations

Vehicle and part manufacturers sometimes use different terminology than diagnostic tools to identify sensor positions. Regardless of the vehicle's engine orientation, the right or left bank is determined by viewing the engine from the rear (opposite the drive belts).

A
Upstream Sensor (Before Converter)
B
Downstream Sensor (After Converter)
C
Left or Front Upstream Sensor (Before Converter)
D
Right or Rear Upstream Sensor (Before Converter)


Common O2 Sensor Contaminants

Oxygen (O2) Sensors commonly fail due to contamination. When checking or replacing an O2 Sensor, visually inspect the sensor body to determine if it has been contaminated by a faulty part or substance upstream, and correct the fault before replacing the sensor.

ANTIFREEZE POISONING
Common Causes:
  • Cracked or warped cylinder head
  • Leaking cylinder head gasket
  • Leaking intake manifold gasket
Antifreeze Poisoned O2 Sensor
Antifreeze Poisoned O2 Sensor
SILICONE POISONING
Common Causes:
  • Use of an improper silicone gasket sealant on the engine

Silicone Poisoned O2 Sensor
Silicone Poisoned O2 Sensor
CARBON BUILDUP
Common Causes:
  • Clogged air filter
  • Leaking or defective fuel injector

Carbon Buildup O2 Sensor
Carbon Buildup O2 Sensor
ACDelco Quality

ACDelco breaks down their premium portfolio of Original Equipment and Aftermarket parts into two tiers: GM Original Equipment and ACDelco Gold.

GM ORIGINAL EQUIPMENT
GM Original Equipment parts are the true OE parts installed during production or validated by GM—designed, engineered, and tested to rigorous standards and backed by General Motors.
ACDELCO GOLD (PROFESSIONAL)
ACDelco Gold parts are the high-quality alternative to OE parts, manufactured to meet GM expectations for fit, form, and function and backed by General Motors.


Alternate/OEM Part Number(s): 88929726

Warranty Information:
24 Months
Warranty Details