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2005 Mustang GT - Multiple Codes

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Old 10-12-2018, 09:39 PM
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giffordj
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Default 2005 Mustang GT - Multiple Codes

So driving home a few days ago, I get the check engine light with a code P0443. Mechanic is leaning heavily towards ECM, but based on some reading I'm ruling it out. The following is the list of events that occured

P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0161 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
P0443 - Evaporative Emission Control System Purge Control Valve Circuit
Check Engine Light Comes on at this point
P0135 - 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0141 - 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0161 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

Any Ideas where to look, or does it appear to be a bad ECM?

This is a Mustang GT 2005
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Old 10-12-2018, 10:14 PM
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imp
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Originally Posted by giffordj View Post
So driving home a few days ago, I get the check engine light with a code P0443. Mechanic is leaning heavily towards ECM, but based on some reading I'm ruling it out. The following is the list of events that occured

P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0161 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
P0443 - Evaporative Emission Control System Purge Control Valve Circuit
Check Engine Light Comes on at this point
P0135 - 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0141 - 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0161 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

Any Ideas where to look, or does it appear to be a bad ECM?

This is a Mustang GT 2005
Yer in luck! I got P0155, no other, replaced all 4 sensors, no change, P0155. Checked sensor heater resistances, all within spec; good, high resistance to ground. Then, started getting p0156 also (heater resistance, 2-2.). Disconnected wires feeding heaters, put in all new wires, same g#d-damned thing.

Then I read somewhere the heater resistance codes are used to indicate certain cat malfunctions. My rig has 165k+, original cats, so definitely possible. That's where I'll go next. The heaters work fine, electrically everything checks. BTW, I replaced the ECM, no change!

If you have lots of miles, or even if not, look to the cats! imp
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Old Yesterday, 09:27 AM
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giffordj
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Update, Mechanic didn't do anything and code has seemed to go away. Previously my mechanic replaced the Control Valve Solenoid, but refunded me since it didn't fix the issue. He checked for a short, didn't find anything. Checked fuse 47, no issues there. Any ideas?
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