8/11/2019 TB2 Incorrect Method Sensors

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2013 NGK Spark Plugs (U.S.A.), Inc.

46929 Magellan - Wixom, Michigan 48393

877-473-6767 - ngksparkplugs.com

NGK Spark Plugs (U.S.A.), Inc. Aftermarket Division46929 Magellan Drive - Wixom, Michigan 48393

Tech Bulletin -

Incorrect testing method of Oxygen Sensors

robing of the O2, AFR, or Wideband sensor is sometimes needed in order to make a properP

diagnosis, however incorrect probing may create immediate, or future, problems. Although it

may be convenient to test the sensor, or sensor harness, on the vehicle with the sharp point of

a Digital Multimeter, or similar, doing this may cause irreversible damage to the integrity of the

circuit. The same damage can also be produced by the use of a t-pin or paperclip.

Potential codes may include:

PO135O2 Sensor 1/1 Heater Performance

PO132Bank 1 Sensor 1 High Voltage

PO036HO2S Heater Control Circuit

PO031Heater Control Circuit Voltage High

PO032Heater Control Circuit Voltage Low

With most engines and data systems being electronically controlled, most sensor data is readily

available via the data stream. Often when diagnosing heater failures or sensor performance,

one will need to probe the sensor harness for data acquisition. The most common failure occurs

while testing the heater circuit; on the other hand, while testing NTK sensors, the failure will

normally occur on the two white wires on the sensor, known as the heater circuit.

Damaged Plastic

Connector

Damage to

Mating Terminal

8/11/2019 TB2 Incorrect Method Sensors

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2013 NGK Spark Plugs (U.S.A.), Inc.

46929 Magellan - Wixom, Michigan 48393

877-473-6767 - ngksparkplugs.com

NGK Spark Plugs (U.S.A.), Inc. Aftermarket Division46929 Magellan Drive - Wixom, Michigan 48393

Connectors, such as in the above images, may exhibit one of many O2 sensor codes if the

terminal is not seated properly. Due to this connector being a part of the vehicle harness, once

the connector is damaged, no sensor will perform properly. Allowing for intermittentconnections will cause an increase in resistance or a shorted circuit. Using the proper Metra-

pack connector test lead will ensure proper diagnosis the first time. Using the proper diagnostic

method and procedure will help to avoid unwanted comebacks and illuminated MIL lights.

or further information on NGK spark plugs, please call NGK Technical Support atF

1-877-473-6767 ext. #2, or visit us on the web at ngksparkplugs.com.