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2008 Ford Mustang 4.6L Manual: P061B, P2106, P0135, P0141, P0151, P0161 - Rich Running, Black Smoke, Stalling & Loss of Power

Model: Ford Mustang Fault Code: P0135 Posted: 2019-09-29 07:12

Hello, I own a 2008 Ford Mustang with a 4.6L manual transmission. The vehicle is exhibiting multiple diagnostic trouble codes: • P061B (TAC System Forced Limited Power) • P2106 (TAC System Forced Limited Power) • P0135 (O2 Sensor Heater Circuit Fault - Bank 1) • P0141 (O2 Sensor Heater Circuit Fault - Bank 2) • P-0151 (O2 Sensor Heater Circuit Fault - Bank 3) • P0161 (O2 Sensor Heater Circuit Fault - Bank 4) Symptoms include: - The engine runs extremely rich, especially in the morning - A noticeable black smoke with a strong fuel odor during startup - Engine stalls after starting - Vehicle enters safe mode once it reaches operating temperature - The floor of the car becomes noticeably hot I have already replaced the following components: - Mass Air Flow (MAF) Sensor - Throttle Body - Air Filter - Fuel Filter - Upstream O2 Sensor (Bank 1) Despite these replacements, the symptoms persist. I am seeking help to identify the root cause of this issue. Any insights or troubleshooting steps would be greatly appreciated.

Related fault codes
P0135P0141P0151P0161P2106
Comments (3)
Anonymous 2019-09-29 12:52

Focus on resolving the O2 sensor heater circuit faults. First, verify that there is a solid 12V supply to each oxygen sensor heater circuit. Next, check the resistance of the heater elements — normal readings are typically around 6 ohms. Measure the resistance of the new sensors and compare it to specifications. For reference, BBBind.com provides detailed wiring diagrams. A P0135 code can indicate one or more of the following: - High resistance in the O2 sensor heater element - Internal short or open circuit within the heater element - High resistance or open/short in the wiring harness connecting to the heater More details: https://www.bbbind.com/p0135

Anonymous 2019-10-06 10:06

I took my car to a local repair shop, and they suspect the Powertrain Control Module (PCM) is not providing sufficient power to the O2 sensors. Is this a plausible diagnosis?

Anonymous 2019-10-06 12:38

This issue may stem from a common 12V power supply problem to the oxygen sensor heaters. If 12V is present at the connectors and wiring integrity is confirmed, and the heater elements are functioning properly (resistance within spec), then the likely cause could be a faulty PCM not supplying the required ground signal to activate the heater circuits. A reputable shop should provide a written guarantee for their diagnosis before performing any work. If the problem persists after repair, hold them accountable. This issue is diagnosable with proper step-by-step testing — as long as variables like sensors and wiring are ruled out.