Question about Hyundai Motor 2002 Elantra

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My car indicates check engine sigh with following two codes 1: p0139 2: p0140

Posted by garcha_davin on

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Scott Bailey

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Hi Garcha,

Both codes relate to O2 Sensor # 2

Code P0139: O2 Sensor Circuit Slow Response - Bank 1, Sensor 2
Code P0140: O2 Sensor Circuit No Activity Detected - Bank 1, Sensor 2

A faulty O2 sensor will mean incorrect signals will be sent to the EFI computer, causing erratic engine running.


Cheers,


"If this has helped you in any way, please rate this solution" :-)



Posted on Jan 27, 2010

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Potential Symptoms

Your check engine light(CEL), or malfuction indicator lamp (MIL) will be illuminated. There will not likely be any noticeable drivability problems other than the MIL. The reason is this: The rear or post catalytic converter Oxygen sensor does not affect fuel deliver(this is an exception on Chryslers). It only MONITORS the efficiency of the catalytic converter. For this reason, you will likely not notice any engine trouble.

Causes

The causes for a P0140 code are fairly few. They could be any of the following:

Shorted heater circuit in O2 sensor. (Usually requires replacement of heater circuit fuse in fuse block also)

Shorted signal circuit in O2 sensor

Melting of harness connector or wiring due to contact with exhaust system

Water intrusion in harness connector or PCM connector

Bad PCM

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This is a fairly specific problem and shouldn't be too difficult to diagnose.

First, start engine and warm up. Using a scan tool, watch the Bank 1, sensor 2, o2 sensor voltage. Normally the voltage should switch slowly above and below .45 volts. If it does, the problem is likely intermittent. You'll have to wait for the problem to surface before you can accurately diagnose.

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