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P1487

EGR Boost Sensor Solenoid Circuit Fault.

  • Kia
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
4
AreaAuxiliary emission controls
87
FaultThe specific fault in that area

What it means

On a Kia, P1487 points to a fault in the circuit of the solenoid that controls the EGR boost sensor (the vacuum or pressure control used to check or regulate exhaust gas recirculation). The engine control unit has seen an electrical fault on that solenoid circuit, such as an open circuit, short or implausible feedback. Exact solenoid location and operation vary by model and engine, so confirm against the specific vehicle's wiring information.

Symptoms

  • Engine management warning light on
  • Slightly rough idle or hesitation at light throttle
  • Reduced performance or poor fuel economy
  • Failed emissions test or higher NOx readings
  • EGR-related faults stored alongside this code

Possible causes

  • Faulty EGR boost sensor solenoid (internal open or short circuit)likely
  • Damaged, chafed or corroded wiring between the solenoid and the control unitlikely
  • Loose, corroded or contaminated connector at the solenoid or control unitlikely
  • Blocked, cracked or disconnected vacuum or pressure hoses to the solenoidpossible
  • Fault in the EGR valve or boost sensor itself affecting the signalpossible
  • Fault inside the engine control unit driver circuitrare

How to diagnose

  1. Read all stored codes and freeze frame data, noting engine temperature, load and speed when the code set, then check for other EGR or sensor codes.
  2. Visually inspect the solenoid, its connector, the wiring harness and vacuum hoses for damage, heat, chafing, oil or water ingress.
  3. Check the connector pins for corrosion, spread terminals or poor tension, and clean or repair as needed.
  4. Measure the solenoid coil resistance and compare it with the manufacturer specification for that model and engine.
  5. Check the solenoid supply voltage and earth or control signal with the ignition on, using the wiring diagram for the vehicle.
  6. Test wiring continuity and check for shorts to earth or to voltage between the solenoid and the control unit.
  7. Operate the solenoid with a bidirectional scan function if available and confirm it clicks and changes vacuum or pressure as commanded.
  8. Clear the code and road test to see whether it returns, rechecking live EGR data.

How to fix

  • Replace the EGR boost sensor solenoid if its resistance or operation is out of specification.
  • Repair or replace damaged wiring and ensure the harness is routed and secured away from heat and sharp edges.
  • Clean, repair or replace faulty connectors and terminals.
  • Replace cracked, blocked or disconnected vacuum or pressure hoses.
  • Repair or replace the EGR valve or boost sensor if testing shows it is the source of the fault.

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but get it checked soon as the EGR system may not work properly, which can affect running and emissions. If it starts running poorly or goes into reduced power, limit driving.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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