P1029 Possible Causes

• Faulty intake manifold air control solenoid
• Intake manifold air control solenoid harness is open or shorted
• Poor electrical connection in intake manifold air control solenoid circuit

How is P1029 Code Repair Done?

Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P1029 Meaning

The upper limit of the intake manifold air control valve position sensor not reached is the generic description for code P1029, but the manufacturer may have a different description for your specific vehicle model and year. Currently, we don’t have more information about OBDII code P1029.

P1029 AUDI Possible Causes

• Faulty intake manifold air control solenoid
• Intake manifold air control solenoid harness is open or shorted
• Poor electrical connection in intake manifold air control solenoid circuit

How is P1029 AUDI Code Repair Done?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check Engine Light On (or Service Engine Soon Warning Light)

P1029 AUDI Meaning

The upper limit of the intake manifold air control valve position sensor is not reached is the generic description for Audi P1029 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about Audi OBDII P1029 code.

How is the P1029 DODGE Code Repaired?

Start by checking the “possible causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P1029 DODGE Meaning

ECU Start Circuit Low is the generic description for the P1029 Dodge code, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have more information about the OBDII P1029 Dodge code.

P1029 VOLKSWAGEN Possible Causes

• Faulty intake manifold air control solenoid
• Intake manifold air control solenoid harness is open or shorted
• Poor electrical connection in intake manifold air control solenoid circuit

How is P1029 VOLKSWAGEN Code Repair Done?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Engine light on (or service engine soon warning light)

P1029 VOLKSWAGEN Meaning

Intake manifold air control valve position sensor upper limit not reached is the generic description for Volkswagen P1029 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about Volkswagen P1029 OB10I code.

P102A Possible Causes

• Faulty auxiliary fuel pump relay
• Faulty auxiliary fuel solenoid
• Fuel solenoid wiring harness is open or short-circuited
• Poor electrical connection in auxiliary fuel solenoid circuit
• Faulty auxiliary fuel pump

How is P102A Code Repaired?

Begin by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated check engine light (or service engine soon warning light)

P102A Meaning

The Engine Control Module (ECM) monitors the auxiliary fuel solenoid circuit for proper operation. The ECM sets the OBDII code when the auxiliary fuel solenoid does not meet factory specifications.

P102A HONDA Possible Causes

• Faulty sub-fuel pump relay
• Faulty sub-fuel solenoid
• Fuel solenoid wiring harness is open or short-circuited
• Poor electrical connection in sub-fuel solenoid circuit
• Faulty sub-fuel pump

How is P102A HONDA Code Repaired?

Start by checking the “possible causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated check engine light (or service engine soon warning light)

P102A HONDA Meaning

The Engine Control Module (ECM) monitors the sub-fuel solenoid circuit for proper operation. The ECM sets the OBDII code when the sub-fuel solenoid does not meet factory specifications.

P102B Possible Causes

• Faulty exhaust temperature sensor
• Exhaust temperature sensor harness is open or shorted
• Poor electrical connection in the exhaust temperature sensor circuit

How is P102B Code Repaired?

Begin by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P102B Meaning

The engine control module (ECM) monitors the exhaust temperature sensor. The ECM sets the OBDII code when the exhaust temperature sensor does not meet factory specifications.

P102B NISSAN Possible Causes

• Faulty exhaust temperature sensor
• Exhaust temperature sensor harness is open or shorted
• Poor electrical connection in exhaust temperature sensor circuit

How is P102B NISSAN Code Repaired?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P102B NISSAN Meaning

The Engine Control Module (ECM) monitors the exhaust temperature sensor. The ECM sets the OBDII code when the exhaust temperature sensor does not meet factory specifications.

P102D Possible Causes

• Faulty O2 sensor heater, bank 2 sensor 2
• Bank 2 sensor 2 heater circuit open or shorted
• Poor electrical connection in O2 sensor heater circuit sensor 2 circuit
• Faulty Engine Control Module (ECM)

How is P102D Code Repaired?

Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check Engine Light illuminated (or Service Engine Soon warning light)

P102D Meaning

In order to obtain a high purification rate of carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx) components in the exhaust gas, a TWC (three-way catalytic converter) is used. For more efficient use of the TWC, the air-fuel ratio must be precisely controlled so that it is always near the stoichiometric air-fuel level. To help the ECM provide precise air/fuel ratio control, a heated oxygen sensor is used.
The heated oxygen sensor is located behind the TWC and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (exhaust gas temperature is low).
When the air/fuel ratio becomes lean, the oxygen concentration in the exhaust gas is high. The heated oxygen sensor informs the ECM that the post-TWC air-fuel ratio is lean (low voltage, i.e., less than 0.45 V).
Conversely, when the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration in the exhaust gas is low. The heated oxygen sensor informs the ECM that the post-TWC air-fuel ratio is rich (high voltage, i.e., greater than 0.45 V). The heated oxygen sensor has the property of drastically changing its output voltage when the air-fuel ratio is near the stoichiometric level.
The ECM uses the additional information from the heated oxygen sensor to determine whether the air/fuel ratio after the TWC is rich or lean, and adjusts the fuel injection duration accordingly. Thus, if the heated oxygen sensor does not function properly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air-fuel ratio control.

P102D LEXUS Possible Causes

• Faulty O2 sensor heater, Bank 2 Sensor 2
• O2 sensor heater Bank 2 Sensor 2 circuit open or shorted
• Poor electrical connection in Bank 2 Sensor 2 O2 sensor heater circuit
• Faulty Engine Control Module (ECM)

How is P102D LEXUS Code Repaired?

Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P102D LEXUS Meaning

To achieve a high purification rate of carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx) components in exhaust gases, a TWC (Three-Way Catalytic Converter) is used. For more efficient use of the TWC, the air-fuel ratio must be precisely controlled so that it is always near the stoichiometric air-fuel level. To help the ECM provide precise air-fuel ratio control, a heated oxygen sensor is used.

The heated oxygen sensor is located behind the TWC and detects the oxygen concentration in the exhaust gases. Since the sensor is integrated with a heater that heats the detection portion, it is possible to detect oxygen concentration even when the intake air volume is low (exhaust gas temperature is low).

When the air-fuel ratio becomes lean, the oxygen concentration in the exhaust gases is high. The heated oxygen sensor informs the ECM that the post-TWC air-fuel ratio is lean (low voltage, i.e., below 0.45 V).
Conversely, when the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration in the exhaust gases is low. The heated oxygen sensor informs the ECM that the post-TWC air-fuel ratio is rich (high voltage, i.e., above 0.45 V). The heated oxygen sensor has the property of drastically changing its output voltage when the air-fuel ratio is close to the stoichiometric level.

The ECM uses the additional information from the heated oxygen sensor to determine whether the air-fuel ratio after the TWC is rich or lean, and adjusts the fuel injection duration accordingly. Thus, if the heated oxygen sensor does not function properly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air-fuel ratio control.