Code
P1195
KIA
P — Powertrain
EGR Boost Or Pressure Sensor Circuit Fault
AI status
Completed
Completed
100%
Causes
- Damaged/shorted wiring or chafed harness to the EGR boost/pressure sensor
- Corroded or loose sensor connector pins
- Failed EGR boost/pressure sensor (internal fault)
- Poor sensor reference voltage or ground (open or high resistance)
- Vacuum or boost leaks affecting sensor readings
- Faulty EGR valve or related actuator affecting expected sensor response
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine performance or hesitation under load
- Rough idle or stalling in some conditions
- Poor emissions / failed emissions test
- Possible increased fuel consumption or turbo/boost control issues
- Intermittent drivability problems
What to check
- Read full freeze frame and pending codes with a scan tool; note operating conditions when code set
- Inspect sensor connector and wiring for damage, corrosion, or looseness
- Back-probe sensor connector to verify reference voltage (usually 5V) and ground integrity
- Monitor live data for EGR boost/pressure sensor signal while varying engine load (idle, acceleration)
- Perform a wiggle test on harness/connectors while monitoring signal for intermittent changes
- Inspect intake, vacuum and boost hoses for leaks or disconnections
Signal parameters
- Reference supply: typically +5 V (verify with vehicle-specific data)
- Ground: near 0 V (solid chassis/ECM ground)
- Signal output: typically in a 0.5–4.5 V range depending on pressure (low pressure/vacuum = lower voltage, higher boost = higher voltage)
- Sensor impedance: manufacturer-specific — check service data if resistance testing is required
Diagnostic algorithm
- Connect a capable scan tool, retrieve P1195 and any related codes, record freeze-frame data and live sensor values.
- Visually inspect the EGR boost/pressure sensor, connector, and harness for damage, corrosion, or water ingress. Repair visible damage.
- With ignition ON (engine off), back-probe the sensor connector: verify correct reference voltage (~5V) and a good ground. If missing, trace/repair wiring to ECM/ground.
- Start engine and monitor sensor signal voltage while varying load. Confirm signal changes smoothly and within expected range relative to manifold/boost pressure. Note intermittent behavior during wiggle test.
- Check intake/boost/vacuum hoses and EGR valve function for leaks or mechanical faults that could produce unexpected sensor readings. Repair as needed.
- If wiring and external connections are good but signal is out of range or inconsistent, swap in a known-good sensor (if available) or bench-test/replace the sensor.
- After repairs, clear codes and perform a road test under the conditions that set the code. Re-scan to confirm code does not return.
- If code persists with verified good sensor and wiring, consider ECM input/output fault diagnosis per manufacturer procedures.
Likely causes
- Wiring harness damage near engine or turbocharger area
- Corroded/loose connector at sensor
- Failed pressure/boost sensor
- Vacuum/boost hose leak or disconnected hose
- EGR valve stuck or mechanically restricted
Fault status
Status
P1195 — EGR Boost/Pressure Sensor Circuit Fault. ECM detected signal outside expected range or circuit malfunction; MIL illuminated. Inspect sensor, wiring, and related EGR/boost components.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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