Code P0137 & P0139 showing up on 06 Accord
#1
05-11-2011 | 08:11 PM
Thread Starter
Joined: May 2011
Posts: 2
Code P0137 & P0139 showing up on 06 Accord
Please help...I have a 2006 Accord VP, 4 cyl, 2.4 liter engine. My check engine light (CEL) came on about a month ago. I went to Auto Zone and they told me that it had two codes (P0137 & P0139).
P0137 reads: Secondary H02S12 (heated oxygen sensor - bank 1 sensor 2) circut low voltage.
P0139 reads: Secondary H02S12 (heated oxygen sensor - bank 1 sensor 2) circuit slow response.
Auto Zone told me to replace the downstrem sensor (in the cat). I bought one on e-bay and replaced it. Reset the ECM and my CEL came back on. I did some research and found that I should ohm the sensor. The original sensor is ohming a 6 ohms. The new sensor is ohming at 10 ohms. Both ohm good according to my research.
I don't know what to do next...What wires do I check or do I have another problem like a lean air/fuel ratio? How would I check?
Thanks for your help,
ajvasquez
P0137 reads: Secondary H02S12 (heated oxygen sensor - bank 1 sensor 2) circut low voltage.
P0139 reads: Secondary H02S12 (heated oxygen sensor - bank 1 sensor 2) circuit slow response.
Auto Zone told me to replace the downstrem sensor (in the cat). I bought one on e-bay and replaced it. Reset the ECM and my CEL came back on. I did some research and found that I should ohm the sensor. The original sensor is ohming a 6 ohms. The new sensor is ohming at 10 ohms. Both ohm good according to my research.
I don't know what to do next...What wires do I check or do I have another problem like a lean air/fuel ratio? How would I check?
Thanks for your help,
ajvasquez
"America is best described by one word, freedom."
--Dwight D. Eisenhower--
--Dwight D. Eisenhower--
#2
05-12-2011 | 11:41 AM
Super Moderator
Joined: May 2006
Posts: 18,398
From: Wisconsin
You would measure the resistance if you had a heater problem (P0141). Measuring between the 2 black wires is the heating element, not the sensor itself.
You can't measure the resistance of the sensor itself at room temperature.
You can't measure the resistance of the sensor itself at room temperature.
#4
05-13-2011 | 08:25 AM
Super Moderator : And A Texan
Joined: Feb 2007
Posts: 9,652
From: Katy, TX
Either you purchased a faulty sensor, or there is a fault in the wiring or connector to the sensor.
Suggest disconnecting the sensor from harness and inspect connection/wiring carefully for damage. Clean connectors w/ contact cleaner and install some electrical grease in the connectors. Reinstall and reset ECU and see if codes return.
If codes return, this suggests a fault in the wiring somewhere between sensor connector and ECU. You will need to disconnect the connector w/ the sensor wires from the ECU and from O2 sensor, and check for faults in those two wires (Check for short to ground first, then ground one end and check that ground is available on other end). Tedious check but necessary.
If all checks good, the ECU board may have a fault. This is unlikely but possible.
good luck
Suggest disconnecting the sensor from harness and inspect connection/wiring carefully for damage. Clean connectors w/ contact cleaner and install some electrical grease in the connectors. Reinstall and reset ECU and see if codes return.
If codes return, this suggests a fault in the wiring somewhere between sensor connector and ECU. You will need to disconnect the connector w/ the sensor wires from the ECU and from O2 sensor, and check for faults in those two wires (Check for short to ground first, then ground one end and check that ground is available on other end). Tedious check but necessary.
If all checks good, the ECU board may have a fault. This is unlikely but possible.
good luck
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