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2000–2002 Audi S4 2.7T

Exhaust temperature (EGT) sensors

6 tools, no lifting, about 72 min

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CodesP1453 bank 1 · P1457 bank 2
Probe torque27 N·m (about 20 lb-ft)
Kit078 998 124 B (both)
No powerCheck fuse 34

What you need

Links open Amazon.

Parts

  • 1 kit
    EGT sensor kit, both banksAudi 078 998 124 B (S4 automatic or manual, both sensors)Replace both together; confirm the current number at an Audi parts counter.
    Amazon
  • 1
    Spare fuseSame rating as the fuse 34 you pullOnly if fuse 34 is blown.
    Amazon

Tools

  • 1
    OBD-II code readerReads and clears P1453 / P1457.
    Amazon
  • 1
    LED test lightLED typePin 3 to engine ground while cranking: it must light.
    Amazon
  • 1 set
    Slotted sensor socketThe cable leaves the probe, so a closed socket won't fit; the size isn't listed.
    Amazon
  • 1 set
    Ratchet and socket set3/8 inch drive, metricFor the box bolts; their size isn't listed.
    Amazon
  • 1
    Torque wrenchRange must include 27 N·m (about 20 lb-ft)Probe torque 27 N·m (about 20 lb-ft).
    Amazon
  • 1
    Flush cuttersTo cut the old cable ties.
    Amazon

Supplies

  • 1 pack
    Cable tiesRe-tie exactly where the old ones were, clear of the exhaust.
    Amazon

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Every step in this video (11)
  1. P1453: bank 1, passenger side. P1457: bank 2, driver side. Both: open circuit.
  2. P1461 or P1462 with a misfire? Fix the misfire, not these.
  3. Each sensor is one part: probe, cable, and electronics box. Replace the whole sensor.
  4. Automatic: both boxes at the back of one side. Manual: one each side. Trace each cable to its turbo.
  5. Engine cold, ignition off, cover off. Unplug the box. Test light: pin 3 to ground. Crank briefly: it must light.
  6. No light? Check fuse 34, far left of the dash; same rating only. Fuse good, still no light? The power feed is faulty: shop job, not new sensors.
  7. The mistake is replacing just one. Old and new read differently, so the warning returns. Power OK? Replace both.
  8. Unplug each box, cut the ties, unbolt it, unscrew the probe. Won't turn? Stop. Don't force it.
  9. Start each new probe by hand, then 27 N·m (about 20 lb-ft).
  10. Bolt the boxes on, plug in, tie the cables as before, clear of the exhaust.
  11. Clear the codes, drive, read again. Same code with new sensors? A shop checks the wiring.

Written by our repair experts, checked against real jobs mechanics logged. If your owner’s manual says something different, go with the manual.

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