P03A9

Cylinder 3 Pressure Sensor Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Rough engine operation
Power reduction
Increased fuel consumption
Check Engine Light Illuminates
Possible misfires

Causes

Faulty cylinder 3 pressure sensor
Open or short circuit in wiring harness
Corroded or damaged electrical connectors
Problems with power or grounding of the circuit
ECU malfunction

How to Fix

Visual inspection of the sensor wiring harness and connectors
Checking resistance and continuity
Measuring the sensor supply voltage
Checking the sensor signal with an oscilloscope
Replacing a faulty pressure sensor
Cleaning connector contacts

Related codes

P03A8 P03AA P03AB P0300 P0303