Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P1407/17815 - EGR Temperature Sensor Signal Too Low
1996 Audi A4 Base, StandardSECTION DTC P1407/17815 - EGR Temperature Sensor Signal Too Low
NOTE:
DTC is set after a cold start (coolant temperature less than 86°F (30°C) as soon as EGR temperature sensor signal is received exceeding 392°F (200°C).
- Inspect EGR temperature sensor for looseness and/or corrosion. EGR temperature sensor is located on intake manifold under throttle body. Repair connector as necessary. If connector was not repaired, go to next step. If connector was repaired, erase DTC memory and test drive vehicle.
- Disconnect EGR temperature sensor electrical connector. Turn ignition on. Using a DVOM, measure voltage between EGR temperature sensor harness connector terminals. Voltage should be approximately 5 volts. If voltage is to specification, go to step 4). If voltage is not to specification, go to next step.
- Repair open circuit between EGR temperature sensor harness connector terminal No. 1 and PCM connector "A" terminal No. 23, and/or between EGR temperature sensor harness connector terminal No. 2 and engine ground. Erase DTC memory and test drive vehicle.
- Turn ignition off. Remove EGR temperature sensor from engine. Using a DVOM on 200 k/ohm scale, connect leads to EGR temperature sensor terminals. Immerse EGR temperature sensor in hot water 176-212°F (80-100°C). Observe DVOM reading. Resistance should change. If resistance changes, go to next step. If resistance does not change, replace EGR temperature sensor. Erase DTC memory and test drive vehicle.
- EGR temperature sensor is okay. Replace faulty PCM. Code new PCM and test drive vehicle. See PCM CODING in this article.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.