P2087 — Exhaust Gas Temperature Sensor Circuit Intermittent #

Note: The definition of code P2087 may vary depending on the vehicle manufacturer (OEM). Always refer to your specific service manual for the most accurate description.

• Exhaust Gas Temperature Sensor Circuit Intermittent (General/Most OEMs)
• EGT Sensor Circuit Intermittent (Ford, GM)
• Exhaust Temp Sensor Signal Fluctuation (Mercedes-Benz)
• Exhaust Gas Temp Sensor Signal Not Stable (Toyota, Lexus)

Summary of DTC P2087 #

P2087 indicates an intermittent electrical issue within the circuit for the exhaust gas temperature (EGT) sensor. The EGT sensor monitors the temperature of exhaust gases and sends this data to the engine control module (ECM). When the ECM detects erratic or unstable readings from the sensor’s circuit—meaning the signal drops in and out—it triggers this code. This condition can disrupt accurate emissions control and may affect engine performance. The code is more common on vehicles with advanced emissions systems, such as those equipped with diesel particulate filters (DPF) or selective catalytic reduction (SCR).

Common Symptoms for Code P2087 #

When P2087 is present, drivers may or may not notice obvious changes. Often, the only indication is an illuminated Check Engine Light (CEL). However, depending on the vehicle and how the ECM responds, you might also observe performance issues. Here are the typical symptoms:

• Check Engine Light illuminated
• Reduced fuel efficiency
• Possible engine derate (reduced power mode, especially on diesels)
• Unstable or fluctuating engine idle
• Occasional exhaust aftertreatment warnings (e.g., DPF/SCR alerts)
• Failed emissions test

Probable Causes for P2087 (In Order of Likelihood) #

The root causes of P2087 typically relate to electrical or sensor faults. Here’s what usually triggers this code, ranked from most to least common:

1. Faulty exhaust gas temperature sensor: Sensor element degrades or fails intermittently.
2. Wiring issues: Damaged, corroded, or loose wires/connectors in the EGT sensor circuit.
3. Poor electrical connections: Loose pins or oxidized terminals at the sensor or ECM.
4. Exhaust leaks near the sensor: Hot gases can damage sensor or wiring insulation.
5. ECM (Engine Control Module) malfunction: Rare, but possible if all else checks out.

Step-by-Step Diagnosis for Code P2087 #

Diagnosing P2087 means methodically tracing the electrical circuit and verifying the sensor’s health. Here’s a proven workflow for technicians and DIYers:

• Scan and record: Use a scan tool to confirm the presence and frequency of P2087. Check for related codes.
• Visual inspection: Examine the EGT sensor, its wiring, and connector for signs of heat damage, corrosion, or loose connections.
• Wiggle test: With the engine running, gently move the wiring harness and connector to see if the code or symptoms reappear.
• Check sensor resistance: With the sensor disconnected, measure resistance using a multimeter. Compare readings to OEM specifications.
• Monitor live data: Watch the EGT sensor signal on the scan tool. Look for sudden drops or spikes indicating an intermittent connection.
• Test continuity: Verify continuity in the sensor circuit from the sensor to the ECM using a wiring diagram.
• Substitute or swap sensor: If possible, swap EGT sensors with a known good one to isolate the fault.
• Check ECM terminals: Inspect for bent, pushed-out, or corroded pins.

Possible Repairs for P2087 #

Once you’ve identified the cause, the following repairs are commonly successful in clearing P2087:

• Replace the faulty EGT sensor with a genuine or high-quality aftermarket part.
• Repair or replace damaged wiring or connectors in the sensor circuit.
• Clean and tighten electrical connections at the sensor and ECM.
• Fix any exhaust leaks near the affected sensor.
• In rare cases, reprogram or replace the ECM if diagnosed as faulty.

Can I Drive with Code P2087? #

Yes, but with caution. In most cases, P2087 will not cause immediate drivability issues, so you can continue driving for short periods. However, if your vehicle enters reduced power mode (limp home mode) or you notice performance drops, seek repairs quickly to avoid further issues. Ignoring this code long-term can lead to increased emissions, possible DPF damage (on diesels), and failed emissions inspections.

Vehicles Most Affected by P2087 #

While P2087 can appear on any vehicle with an exhaust gas temperature sensor, it’s more frequently reported on models with advanced emissions systems. Here are some commonly affected brands and models:

• Ford F-Series (especially diesel)
• Chevrolet Silverado/GMC Sierra (diesel)
• Ram 2500/3500 (diesel)
• Volkswagen/Audi TDI models
• Mercedes-Benz BlueTEC diesels
• Toyota Hilux and Land Cruiser (diesel)

Frequent Mistakes & Best Practices (P2087) #

When diagnosing or repairing P2087, certain pitfalls are common. Here’s how to avoid them and ensure a lasting fix:

• Replacing the sensor without inspecting wiring: Always check the harness and connectors—heat and vibration often cause intermittent faults.
• Using low-quality aftermarket sensors: Poor-quality parts may not communicate consistently with the ECM. Choose OEM or reputable brands.
• Overlooking exhaust leaks: Hot leaks near the sensor can quickly damage new components.
• Skipping live data analysis: Monitoring the sensor signal in real-time often reveals intermittent issues missed by static tests.
• Neglecting to clear codes after repair: Always reset the ECM and verify the fix by road testing.

Quick FAQ for P2087 #

Is it expensive to fix code P2087?
Usually, the repair is moderate in cost—EGT sensor replacement typically ranges from $100–$300 including labor, but wiring repairs can vary based on severity and location.

Will P2087 cause my car to fail an emissions test?
Yes, in most cases. An active Check Engine Light for an emissions-related code like P2087 will generally result in an automatic failure for OBD-II-based emissions inspections.