URGENT: Got Check Engine Light + FordPass notification (Picture Inside)

[kinelisch]

I went to the car wash earlier, and shortly afterward I got a “Check Engine Light” notification on my phone, and the CEL on the dash came on.

The only modification I have is a Steeda H-pipe (Installed 6 months ago) and carbon traps removed. There aren’t any sensors located where the H-pipe is installed correct?. I’m heading to the Ford dealer in a few hours and want to be informed in case they try to attribute the issue to the H-pipe.

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[Alan Applegate]

Probably not, but during the installation, one of the 02 sensor's wiring could have been damaged, etc.

 

[kinelisch]

Probably not, but during the installation, one of the 02 sensor's wiring could have been damaged, etc.

I have had the H pipe for about 7 months now so not sure.

 

[Upacurb]

The 02 sensors arent near the H pipe

Its probably just mad you drove it through a car wash lol

 

[dusman59]

Maybe something came loose.

 

[Alan Applegate]

My thinking was... All of the piping has to hang down while the pipe is being installed. Assuming the wiring was slightly damaged, over time that wiring connection could fail.

 

[Sofa King]

Car wash? Something get wet that shouldn't have? Keep us posted.

 

[kinelisch]

The 02 sensors arent near the H pipe

Its probably just mad you drove it through a car wash lol

starting to think that…

Car wash? Something get wet that shouldn't have? Keep us posted.

As soon as I left the car wash the CEL came on. I’ll keep you guys posted.

 

[kinelisch]

I went to the dealership today, and here’s what they found — check out those codes. I’ll need to schedule a follow-up visit soon. It looks like they cleared the Check Engine Light, because it wasn’t on when I picked up the car after the oil change. I drove about 30 miles home and it still hasn’t come back on. Not sure if it just takes some time for the CEL to reappear.

This is what ChatGPT says about the codes:

P0152 – O₂ Sensor Circuit High Voltage (Bank 2, Sensor 1)

• What it is: Indicates the upstream (pre-cat) oxygen sensor on Bank 2 (the side opposite cylinder 1) is sending abnormally high voltage, usually signaling a rich air-fuel mixture.

• Common causes:
• Faulty O₂ sensor
• Damaged wiring or connectors
• Engine running rich (bad injectors, fuel pressure regulator, etc.)

Risks if ignored:

• Poor fuel economy
• Increased emissions
• Potential catalytic converter damage


Pro fix-forward steps:

• Visually inspect wiring and connectors for damage
• Check sensor voltage output with a scan tool or multimeter
• If faulty, replace the sensor (commonly Bank 2 Sensor 1)
• Clear codes, test-drive, ensure issue doesn’t return

⸻

B12BA – Body Code (likely Lock Status LED Drive Circuit Shorted to Ground)

• What it is: A manufacturer-specific body code. Likely indicates a Vref (5 V) drive circuit for a lock status LED (front) has shorted to ground .
• Community feedback (Mustang 2024+):
• Users report the code appears, clears, and doesn’t return. Likely a transient or non-critical glitch .

Pro tip:

• Clear the code and monitor. If it doesn’t reappear and features (like locks or LEDs) still function, you’re likely in the clear.

⸻

B108E – Display System Electrical Fault

What it is: A fault code pointing to a general electrical failure in the display system — instrument cluster, infotainment, or other screens.

• Insights from various sources:
• Might involve airbag indicator circuit or FDIM/APIM modules .
• Could be related to blank or unresponsive displays, especially in newer Mustang/Mach-E, plus infotainment issues


Pro troubleshooting steps:


• Try resetting SYNC/APIM (via settings or disconnecting battery briefly) .
• Inspect wiring to the display modules; check for loose or corroded connections.
• If symptoms persist (blank cluster/media screen), dealer may need to run diagnostics or replace the module(s).

⸻

Forward-Looking Recommendations

• Prioritize the P0152 — it’s powertrain-related and affects performance, emissions, and potential long-term damage.

• Track recurrence of B12BA and B108E. If they’re one-offs and nothing malfunctions visibly, they can likely wait.

Pro tip: When you do schedule the visit:

• Ask the shop to monitor the upstream O₂ sensor data live.
• Request a diagnostic check of the display system (module health, connections).
• If any features (locks, mirrors, cluster, infotainment) are acting up, flag them now—even if the codes clear.

⸻

Quick Summary:

P0152 Emissions/Engine Upstream O₂ sensor high voltage (rich condition) High (fix now)

B12BA Body/Body Electronics Lock LED circuit short glitch Low, monitor

B108E Display/Infotainment Electronics/display module fault Medium, watch test

 

[Germansheperd]

You either got a freak accident bad O2 or someone was messing around where they shouldn’t have been.
The upstream O2 is nowhere near the H-pipe/resonator.

 

[Zig]

I went to the dealership today, and here’s what they found — check out those codes. I’ll need to schedule a follow-up visit soon. It looks like they cleared the Check Engine Light, because it wasn’t on when I picked up the car after the oil change. I drove about 30 miles home and it still hasn’t come back on. Not sure if it just takes some time for the CEL to reappear.

This is what ChatGPT says about the codes:

Code Breakdown & What It Means

P0152 – O₂ Sensor Circuit High Voltage (Bank 2, Sensor 1)


• What it is: Indicates the upstream (pre-cat) oxygen sensor on Bank 2 (the side opposite cylinder 1) is sending abnormally high voltage, usually signaling a rich air-fuel mixture .


• Common causes:


• Faulty O₂ sensor


• Damaged wiring or connectors


• Engine running rich (bad injectors, fuel pressure regulator, etc.)


• Risks if ignored:


• Poor fuel economy


• Increased emissions


• Potential catalytic converter damage


• Pro fix-forward steps:


• Visually inspect wiring and connectors for damage


• Check sensor voltage output with a scan tool or multimeter


• If faulty, replace the sensor (commonly Bank 2 Sensor 1)


• Clear codes, test-drive, ensure issue doesn’t return


⸻

B12BA – Body Code (likely Lock Status LED Drive Circuit Shorted to Ground)


• What it is: A manufacturer-specific body code. Likely indicates a Vref (5 V) drive circuit for a lock status LED (front) has shorted to ground .


• Community feedback (Mustang 2024+):


• Users report the code appears, clears, and doesn’t return. Likely a transient or non-critical glitch .


• Pro tip:


• Clear the code and monitor. If it doesn’t reappear and features (like locks or LEDs) still function, you’re likely in the clear.

⸻

B108E – Display System Electrical Fault


• What it is: A fault code pointing to a general electrical failure in the display system — instrument cluster, infotainment, or other screens .


• Insights from various sources:


• Might involve airbag indicator circuit or FDIM/APIM modules .


• Could be related to blank or unresponsive displays, especially in newer Mustang/Mach-E, plus infotainment issues .


• Pro troubleshooting steps:


• Try resetting SYNC/APIM (via settings or disconnecting battery briefly) .


• Inspect wiring to the display modules; check for loose or corroded connections.


• If symptoms persist (blank cluster/media screen), dealer may need to run diagnostics or replace the module(s).


⸻


Forward-Looking Recommendations


• Prioritize the P0152 — it’s powertrain-related and affects performance, emissions, and potential long-term damage.


• Track recurrence of B12BA and B108E. If they’re one-offs and nothing malfunctions visibly, they can likely wait.


• Pro tip: When you do schedule the visit:


• Ask the shop to monitor the upstream O₂ sensor data live.


• Request a diagnostic check of the display system (module health, connections).


• If any features (locks, mirrors, cluster, infotainment) are acting up, flag them now—even if the codes clear.


⸻

Quick Summary Table

Code System Likely Issue Priority


P0152 Emissions/Engine Upstream O₂ sensor high voltage (rich condition) High (fix now)


B12BA Body/Body Electronics Lock LED circuit short glitch Low, monitor


B108E Display/Infotainment Electronics/display module fault Medium, watch test

I developed a rough idle today for about 10 minutes. Not sure what’s going on. It went away but it still lingering in my mind. Do you recommend disconnecting/reconnecting the battery?

almost beginning to sound like a ‘circuit short glitch Low, monitor’ recurrence.

 

[kinelisch]

You either got a freak accident bad O2 or someone was messing around where they shouldn’t have been.
The upstream O2 is nowhere near the H-pipe/resonator.

Yeah agreed. Nothing is messed with the engine except carbon traps removed. Other than that everything is stock and car has 7,000 miles.

 

[steveo1960]

almost beginning to sound like a ‘circuit short glitch Low, monitor’ recurrence.

Agree.
O2 sensors operate on the hairy edge of go/nogo and due to EPA it's heavily biased towards nogo.

Follow the K.I.S.S. principle of troubleshooting.
Was the car functioning correctly?
What did you do to make it function INCORRECTLY?
Follow that path.. I say water pooling in places where it shouldn't.
Could be anything though.

 

[MikeyV]

FWIW - I had an emission issue where one of the o2 sensors would not set due to not getting hot enough. There's a check that the OBD goes thru before it says "your emissions is all good, broh" and one of them is seeing if the O2 sensor is up to temp.

The reason for my error was that the Borla X-pipe I had installed was kind of cock-eyed and the joint was slightly loose (one of those ball/socket type flanges). This caused a leak and didn't allow the sensor to get hot enough to clear the check.

I was actually able to feel the exhaust coming out of the leak - took it in to have it tightened/realigned it cleared the code right away and my car passed smog.

You can check these codes with a little clear OBD monitor.

Make sure those H-pipe clamps are tight!!

 

[Neggytive]

frankly, I scan the car, record the codes (scanner saves it as a file) and I clear the codes and tell the customer to drive the car and come back if the C.E.L. comes on

Too many times a car will just toss a code and it is a glitch.

If you went into a shop, and they charged you $180 dollars for a "diagnostic fee" for a code read and scan, you'd be buying a cheap code reader too just to be able to pull the codes and clear them, then see if they return.

Some codes will return, and that is when you go deep, but a code is not a diagnosis it is a symptom

Say you get a P0304 for a #4 misfire

Is it a plug? Tube? a leaky valve cover gasket letting oil into the plug well? Coil? Wire to coil? Bad driver in the ECM? bad injector? bad valve allowing air in/loss of compression? Leaky head gasket letting a little coolant in the cylinder that causes a misfire on start up/cold engine?

Are you looking at data like fuel trim making sure it is within just a couple of percent of where it should be?

An O2 code comes back pretty quick because the cat efficiency (P0420) is always comparing the upstream and downstream sensor and the sensors play a big part in adjusting the A/F ratios

With a good graphing scanner, and even some of the $50 dollar ones you can look at the sensor data and figure out if they are working by voltage and waveform

And you don't need a $3000 scanner to do this, a bunch of the cheap scanners show you this data

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