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Common check engine lights

Below is a list of common check-engine lights that can illuminate after the installation of aftermarket parts. These lights could indicate incorrect or missing information when filling out our tuning specifications form or a vehicle malfunction. It is important to ensure that there are no check-engine lights on prior to tuning your vehicle.

 

General

P1000 – On-Board Diagnostic (OBDII) System Readiness Test Not Complete

Possible causes can be battery recently disconnected or pcm recently flashed, an OBD monitor concern occurred before completion of a drive-cycle, DTC’s recently cleared with tuner or scan tool or the vehicle is new from the factory.

 

P068A – ECM/PCM Power Relay De-Energized Performance - Too Early

This is a typical code for all 2015+ Mustangs after flashing and it can just be cleared and drive you will be fine. Or let the car sit for a little longer before starting after loading the tune. They can also slow down the loading process.

 

Exhaust

P0135/P0155 - O2 Heater Circuit

These codes are very common for vehicles equipped with Long Tube headers where extensions have been used or the physical sensors have been swapped over to new parts and are not tune related.  Possible causes of these codes are damaged O2 sensors, heater circut short to voltage, water in the harness, open VPOWER circuit, open GND circuit, Low Battery Voltage, incorrect connections, or corrosion.  

 

P0420/P0430 – Catalyst System Efficiency Below Threshold (Bank 1 & 2)

These codes are very common for vehicles equipped with aftermarket catalytic converters or off-road pipes where the catalysts have been removed. It is important to let us know you have changed from the factory parts when filling out your tuning specifications form.

 

P0141/P0161 – 02 Heater Circuit Error (Bank 1 and 2, Rear Sensor)

If you have completely removed your rear oxygen sensors from the car and they are no longer plugged into the vehicles harness these codes would appear. It is important to let us know you have completely removed the sensors from the car when filling out your tuning specifications form.

 

P219A/P219B – Bank 1 & Bank 2 Air-Fuel Imbalance

These codes commonly appear in 2011+ Mustang’s with Long Tube Headers. Many aftermarket header companies locate the 02 sensors in different locations from the factory or different locations on each side of the motor. Other common issues can be found within the 02 sensor extension harness, PCV system error or leaks (breathers installed on one side or both sides of the engine), exhaust or air intake leaks and ignition system problems.  If you did not request an off-road tune you will need an update.

 

P0133/P0135 - 02 Sensor Circuit Slow Response (Bank 1&2, Sensor 1)

These codes are very common for vehicles equipped with Long Tube Headers. If the code is appearing and you have long tube headers, please contact a Bama Tuning Experience Specialist and we will get this resolved.

 

Cold Air Intake

P0171/P0174 – System Too Lean (Bank 1 & 2)

This can also be present from an exhaust leak before/after the O2 sensors.  If you just installed headers or exhaust, please check for leaks

 

This is most common for 2005+ Ford vehicles equipped with aftermarket cold air intake systems (CAI’s). Many CAI manufacturers will install “reduction sleeves” inside the cold air intake to eliminate the need for aftermarket tuning. This code will usually appear if you assumed the insert was still installed when it has been removed.

It is important to ensure that you verify if the sleeve/insert is installed or if it has been removed when completing your tuning specifications form so that a Bama Tuning Experience Specialist makes the proper adjustments to your custom tunes.

Another possible cause could be instances where different size intakes are available and your tune is programmed for the wrong size (For example – C&L makes a 95mm and 85mm intake). If you are not sure what intake you have please measure the opening or contact a Bama Tuning Experience Specialist.

 

 

P0172/P0175 – System Too Rich (Bank 1 & 2)

This is most common for 2005+ Ford vehicles equipped with aftermarket cold air intake systems (CAI’s). Many CAI manufacturers will install “reduction sleeves” inside the cold air intake to eliminate the need for aftermarket tuning. This code will usually appear if you assumed the insert was removed but it is still installed.

It is important to ensure that you verify if the sleeve/insert is installed or if it has been removed when completing your tuning specifications form so that a Bama Tuning Experience Specialist makes the proper adjustments to your custom tunes.

Another possible cause could be instances where different size intakes are available and your tune is programmed for the wrong size (For example – C&L makes a 95mm and 85mm intake). If you are not sure what intake you have please measure the opening or contact a Bama Tuning Experience Specialist.

 

Throttle Body

P2104– Throttle Actuator (TAC) Forced Idle

This DTC sets when the TAC system is in failure mode effects management (FMEM) mode of forced idle.  Possible causes are a bad throttle body or bad throttle body harness/jumper typically found when switching to Super Cobra Jet Throttle Bodies

 

P2111 – Throttle Actuator (TAC) - Stuck Open

This DTC sets when the throttle plate is at a greater angle than commanded.  Possible causes are binding throttle body or stuck open, TAC Motor circuit open, TAC Motor circuits cross wired, TAC Motor circuits are shorted together typically found in a bad/improper install of jumper harness when converting to a Super Cobra Jet TB

 

P0506 – Idle Air Control System RPM Lower Than Expected

This code is set when the PCM detects an engine idle speed is less than desired. Possible causes are air intake restrictions, engine mechanical issue or slugged throttle body, which would require cleaning. There are instances where a bad throttle body or throttle body internals are defective and need replacement.

 

 

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