P1400 on Porsche
EGR / DPFE Sensor Circuit Low Voltage (manufacturer-specific)
P1400 on Porsche vehicles indicates egr / dpfe sensor circuit low voltage (manufacturer-specific). Au7o has documented this code across 1 Porsche model — most commonly on Macan. P1xxx codes are manufacturer-defined, so confirm P1400 against your specific brand before buying parts. On Ford — the best-documented version — it is DPFE (Differential Pressure Feedback EGR) sensor circuit low voltage: the PCM saw an out-of-range low signal from the sensor that measures EGR flow. Volkswagen/Audi use P1400 for an EGR valve circuit electrical fault, GM uses it for the cold start emission reduction control system, and Subaru for a fuel tank pressure control solenoid valve circuit fault. In each case it is an emissions fault: the check engine light comes on, the vehicle will fail an emissions test, and you may notice rough idle, pinging, or slightly reduced fuel economy. Typical repair costs on Porsche range from $400 to $2,500, depending on the specific model and root cause.
Common Causes of P1400
- •Failed DPFE / EGR pressure feedback sensor (Ford)
- •Cracked, collapsed, melted, or disconnected rubber hoses between the EGR tube and the DPFE sensor
- •Clogged EGR passages or a carbon-fouled EGR valve
- •Open, shorted, or corroded wiring/connector in the sensor or EGR solenoid circuit (VW/Audi: EGR valve circuit electrical fault)
- •Failed EGR vacuum regulator solenoid
- •Failed PCM/ECU driver circuit (rare — verify everything else first)
P1400 on Porsche by Model
Porsche Macan(1 issue)
- Diesel 3.0 V6 TDI EGR/DPF Clogging and AdBlue Line Splitting (EU-spec)2014-2018
The EU-market Macan S Diesel (3.0 V6 TDI) is prone to EGR valve faults and diesel particulate filter (DPF) clogging, especially on cars used for short urban journeys that never complete a hot regeneration. EGR electrical faults can also block regen from running, compounding soot buildup. Additionally, the AdBlue (SCR) pipework at the rear of the engine bay splits, leaving crystallized AdBlue residue around the connectors and triggering emissions warnings. These are highly relevant to German/EU diesel owners; this engine was not sold in the US.
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View P1400 across all makes →Frequently Asked Questions
What does P1400 mean on Porsche?▼
P1400 stands for "EGR / DPFE Sensor Circuit Low Voltage (manufacturer-specific)." P1xxx codes are manufacturer-defined, so confirm P1400 against your specific brand before buying parts. On Ford — the best-documented version — it is DPFE (Differential Pressure Feedback EGR) sensor circuit low voltage: the PCM saw an out-of-range low signal from the sensor that measures EGR flow. Volkswagen/Audi use P1400 for an EGR valve circuit electrical fault, GM uses it for the cold start emission reduction control system, and Subaru for a fuel tank pressure control solenoid valve circuit fault. In each case it is an emissions fault: the check engine light comes on, the vehicle will fail an emissions test, and you may notice rough idle, pinging, or slightly reduced fuel economy. On Porsche specifically, this code is documented across 1 model.
What causes P1400 on Porsche vehicles?▼
Common causes on Porsche: Failed DPFE / EGR pressure feedback sensor (Ford), Cracked, collapsed, melted, or disconnected rubber hoses between the EGR tube and the DPFE sensor, Clogged EGR passages or a carbon-fouled EGR valve, Open, shorted, or corroded wiring/connector in the sensor or EGR solenoid circuit (VW/Audi: EGR valve circuit electrical fault), Failed EGR vacuum regulator solenoid. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1400 on a Porsche?▼
Repair costs on Porsche range from $400 to $2,500, depending on the specific model and root cause.
Which Porsche models have P1400 documented?▼
Au7o has documented P1400 on 1 Porsche model: Macan.