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AUDI
P242A
P0544

P242A P0544 Audi 3.0 TDI V6 – Exhaust Gas Temperature Sensor Diagnostics

Diagnostic Priority: High
Complexity Level: Advanced

Diagnostic guide for P242A and P0544 on Audi/VW 3.0 TDI V6. Faulty EGT sensor 1 (G235) and sensor 3 (G495), open circuits, and DPF regen blocks.

Vehicle

AUDI

Codes

2 units

Analysis Type

Technical Expert

Status

Analyzed

Technical Analysis

REF: #9AF327

Fault codes P242A and P0544 indicate thermal breakdown of exhaust gas temperature sensors G235 (pre-turbo) and G495 (pre-DPF) on VAG 3.0 TDI V6 engines, blocking active DPF regeneration.

Expected Symptoms

Glow plug light flashing and DPF icon illuminated on instrument cluster on AUDI (DTCs: P242A, P0544)
Engine enters limp home mode restricting engine output above 2,200 RPM
Acrid exhaust odor and elevated fuel consumption due to aborted DPF regenerations

System Impact

Drivetrain
Engine Control
Emission Control

Potential Fault Sources

01Defective differential pressure sensor G450 or split silicone sample lines (affecting AUDI subsystem for P242A, P0544)
02Severe soot loading in DPF caused by short-trip driving and fouled injectors
03Sticking EGR cooler changeover flap or faulty exhaust gas temp sensor G235 (logged fault: P242A)

Workflow / Methodology

01

Verify supply voltage and sensor telemetry for P242A, P0544 on AUDI with multimeter at key ON.

02

Check DPF differential pressure with key ON: must read precisely 0 hPa (0.48–0.52 V).

03

Query calculated soot mass and oil ash volume in ECM live data blocks.

04

Execute service regeneration cycle under load following sensor replacement.

Live Data & Mätvärdestoleranser (Är/Bör-värden)

Fabriksgodkända referensvärden vid diagnos och live-avläsning

Mätvärdesblock
Parameter / SignalTestvillkorBör-värde (Normalt)Avvikelse / Varning
GivarreferensspänningTändning på4.95 – 5.05 V< 4.75 V (Kortslutning/Spänningsfall)
Signalretur tomgångDriftstemperaturInom fabriksintervall ±5%Signalkorruption el avbrott

Assessment & Action Proposal

Technical Recommendation

Install a new genuine exhaust gas temperature sensor (G235/G495) with anti-seize paste on threads. Clear DTCs.

Need a deeper analysis? Use our advanced fault code analyzer to find likely connections and in-depth guidance.

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Vanliga frågor om dessa felkoder

Vad är den primära orsaken till felkoderna?

Fault codes P242A and P0544 indicate thermal breakdown of exhaust gas temperature sensors G235 (pre-turbo) and G495 (pre-DPF) on VAG 3.0 TDI V6 engines, blocking active DPF regeneration.

Kan man köra vidare med tänd motorlampa / varningslampa?

Körning med aktiva felkoder kan leda till strypt motoreffekt (nödläge / Limp Home), blockerad partikelfilterregenerering eller följdskador på mekaniska komponenter. Felsökning bör genomföras omgående.

Hur åtgärdas kombinationen på säkrast sätt?

Install a new genuine exhaust gas temperature sensor (G235/G495) with anti-seize paste on threads. Clear DTCs.