How to Diagnose & Clear DF002-0110 with iCarsoft CR MAX BT: Fix PSA Group Intake Pressure Sensor Faults

If you own a PSA Group vehicle (Peugeot, Citroën, DS) and your check engine light illuminates, a diagnostic scan revealing DF002-0110 points to a critical issue in the intake pressure sensor circuit. This PSA-specific fault code disrupts engine performance by skewing the data the ECM uses to optimize fuel and ignition—making prompt diagnosis essential.

Basic tools may only read the code but fail to analyze the sensor circuit or access PSA-specific data. The iCarsoft CR MAX BT changes this: its wireless connectivity, PSA-dedicated functions, and real-time monitoring turn vague “sensor faults” into actionable repairs. Below is a complete guide to diagnosing and clearing DF002-0110.

First: Understand DF002-0110—What It Is & Why It Happens

Effective diagnosis starts with knowing the intake pressure sensor’s role and the common triggers for DF002-0110. This sensor is the “lungs” of your engine’s performance—its failure disrupts core functionality.

The Role of the Intake Pressure Sensor

Mounted on the intake manifold, the intake pressure sensor measures the absolute pressure of air entering the engine. It converts this pressure into an electrical signal (0.5V to 4.5V, depending on load) and sends it to the ECM. The ECM uses this data to:

• Adjust the air-fuel mixture (leaner at low pressure, richer at high pressure).
• Optimize ignition timing (advance or retard based on airflow).
• Control turbo boost (in turbocharged PSA models like Peugeot 308 GT).

When the sensor sends a signal below 0.5V (DF002-0110), the ECM assumes a “no-pressure” scenario and defaults to a fuel-heavy mixture—causing the symptoms you’ll notice.

Key Symptoms of DF002-0110

Common Causes of DF002-0110

Why iCarsoft CR MAX BT Is Ideal for DF002-0110

DF002-0110 requires PSA-specific diagnostics—something basic scanners can’t provide. The CR MAX BT is built for this task, with features tailored to Peugeot, Citroën, and DS systems.

Step-by-Step: Diagnose DF002-0110 with iCarsoft CR MAX BT

Follow this structured process to pinpoint the root cause of DF002-0110. The CR MAX BT eliminates guesswork and ensures you fix the real issue—not just the symptom.

1. 1. Connect the CR MAX BT & Confirm the Code
   • Plug the CR MAX BT’s OBD-II adapter into your vehicle’s port (under the dashboard). Turn the ignition to “On” (engine off) to power the adapter.
   • Enable Bluetooth on the CR MAX BT, pair it with the adapter (follow on-screen prompts—pairing takes 30 seconds), and select Vehicle Make > PSA Group.
   • Use Auto VIN Identify to auto-detect your vehicle (e.g., “2020 Citroën C3 1.2L PureTech”). This ensures you get PSA-specific code definitions.
   • Navigate to Engine Control Module > Fault Codes > Read Fault Codes. Confirm DF002-0110 is present, then tap Code Details to verify it’s “Intake Pressure Sensor Signal Too Low.” Check for related codes (e.g., DF003) to add context.
2. 2. Analyze Real-Time Intake Pressure Data
   • Go to Engine Control Module > Live Data > Intake System and select these 4 parameters (use “Add to Favorites” to track them side-by-side):
     • “Intake Pressure Sensor Voltage” (target: 0.5V–4.5V)
     • “Actual Intake Pressure (kPa)” (target: 30–50 kPa at idle)
     • “Target Intake Pressure (kPa)” (ECM’s expected value)
     • “Engine RPM” (to cross-reference with pressure)
   • Start the engine and let it warm up to operating temperature (10–15 minutes, until coolant temp reaches 180°F). Do not rev the engine during warm-up—this skews pressure readings.
   • Interpret the data:
     • DF002-0110 Confirmation: Voltage <0.5V + Actual pressure < Target pressure (e.g., 20 kPa vs. 40 kPa target) = Low signal from sensor.
     • Vacuum Leak Clue: Voltage normal (0.5V–1.0V at idle) but Actual pressure < Target pressure = Leak in intake manifold.
     • Clogged Intake Clue: Voltage normal but Actual pressure drops when accelerating = Restricted airflow (dirty filter/throttle body).
3. 3. Inspect for Intake Manifold Vacuum Leaks
   • Use the CR MAX BT’s Component Location tool to find the intake manifold, vacuum hoses, and sensor mounting point (varies by PSA model—e.g., Peugeot 508’s manifold is on the right side of the engine).
   • Visually inspect for leaks:
     • Cracks in the intake manifold (common in older Peugeots).
     • Loose or cracked vacuum hoses (check the hose connecting the manifold to the brake booster).
     • Worn intake manifold gaskets (look for oil or soot around the gasket edges).
   • For a thorough test: Use a smoke machine (sold separately) to inject smoke into the intake system. If smoke escapes from any area, it’s a leak. While testing, monitor live pressure on the CR MAX BT—sealing the leak should make Actual pressure match Target pressure.
   • Repair leaks: Replace cracked hoses, tighten loose clamps, or install a new intake manifold gasket (use the CR MAX BT’s Torque Specs feature for proper tightening—e.g., 8 ft-lbs for Citroën C4 gaskets).
4. 4. Test the Intake Pressure Sensor & Circuit
   • Step 1: Locate the Sensor — Use the CR MAX BT’s component guide to find the sensor (mounted on the intake manifold, usually with a 3-pin connector).
   • Step 2: Disconnect the Connector — Turn off the engine, disconnect the sensor’s electrical connector, and inspect pins for corrosion (green/white buildup). Clean corroded pins with electrical contact cleaner.
   • Step 3: Circuit Voltage Test (with CR MAX BT Multimeter):
     • Set the tool to “DC Voltage.” Connect one probe to the connector’s “Reference Voltage” pin (refer to CR MAX BT’s Wiring Diagram—usually Pin 2) and the other to ground (Pin 3).
     • Turn ignition to “On” (engine off)—voltage should read ~5V (from the ECM). No voltage = Broken wire or ECM fault.
   • Step 4: Sensor Resistance Test:
     • Set the multimeter to “Ohms.” Connect probes to the sensor’s signal pin (Pin 1) and ground pin (Pin 3). Refer to CR MAX BT’s PSA data for resistance specs (typically 10–20 ohms).
     • Resistance outside specs = Faulty sensor (needs replacement).
   • Step 5: Bi-Directional Test:
     • Reconnect the sensor connector. Navigate to Special Functions > Engine Tests > Intake Pressure Sensor Activation.
     • Send a command to “Simulate 2.0V Signal.” The CR MAX BT should display the sensor’s response—if voltage doesn’t change to 2.0V, the sensor or circuit is faulty.
5. 5. Clean or Replace the Intake Pressure Sensor
   • If Sensor Is Contaminated:
     • Remove the sensor (use CR MAX BT’s Removal Guide—no special tools needed for most PSA models).
     • Clean the sensor’s pressure port with specialized sensor cleaner (avoid throttle body cleaner—it damages sensor components). Let it dry completely (10 minutes).
     • Reinstall the sensor and torque to specs (e.g., 5 ft-lbs for Peugeot 308).
   • If Sensor Is Faulty:
     • Use the CR MAX BT’s Part Lookup to find the OEM replacement (e.g., PSA 9807565480 for Citroën C5 Aircross).
     • Install the new sensor, reconnect the connector, and ensure pins are fully seated.
   • Clean the Intake System (If Clogged):
     • Replace the air filter (use CR MAX BT’s Maintenance Schedule to confirm filter type).
     • Clean the throttle body with throttle body cleaner (follow CR MAX BT’s Throttle Body Cleaning Guide for PSA vehicles).
6. 6. Clear the Code & Verify Repairs
   • Step 1: Clear the Code — Navigate to Engine Control Module > Fault Codes > Clear Fault Codes. Select DF002-0110 and confirm deletion. Do not skip this—old codes may interfere with ECM relearn.
   • Step 2: ECM Relearn (Mandatory for PSA Vehicles):
     • Go to Special Functions > Engine > ECM Relearn > Intake Pressure Sensor.
     • Follow prompts: Start the engine, let it idle for 2 minutes, then rev to 2,000 RPM 3 times. The CR MAX BT sends new sensor parameters to the ECM.
   • Step 3: Test Drive & Verification:
     • Take a 20–30 mile test drive (include city stop-and-go and highway driving). Use the CR MAX BT’s Data Logging to record intake pressure data.
     • During the drive, confirm: No rough idle, smooth acceleration, and no check engine light.
     • After the drive, re-scan for codes: No DF002-0110 + normal voltage/pressure = Repair successful.

How to Prevent DF002-0110 from Recurring

The CR MAX BT helps you maintain your PSA vehicle’s intake system, avoiding future DF002-0110 codes with proactive care.

1. 1. Monthly Intake System Health Scans
   • Use the CR MAX BT’s Quick Tests > Intake System Health to check sensor voltage, intake pressure, and vacuum levels. Set reminders via the tool’s “Service Schedule” feature.
   • Early warning signs to watch for: Voltage dropping below 0.8V at idle or pressure differing from target by >10 kPa.
2. 2. Replace Air Filters on Schedule
   • Use the CR MAX BT’s Maintenance Reminders to replace the air filter every 15,000–30,000 miles (or 1 year, whichever comes first). A dirty filter causes sensor contamination and clogs.
   • The tool’s Part Lookup recommends the correct OEM filter for your PSA model (e.g., Peugeot 2008 uses filter 1618935980).
3. 3. Inspect Vacuum Hoses Quarterly
   • Use the CR MAX BT’s Component Location to find vacuum hoses (critical for intake pressure). Check for cracks, dry rot, or loose clamps—replace worn hoses immediately.
   • Apply dielectric grease to sensor connectors to prevent corrosion (especially in humid climates).
4. 4. Update ECM Software Annually
   • Use the CR MAX BT’s One-Key Upgrade to install the latest PSA ECM software. Updates often fix sensor calibration issues that cause false DF002-0110 codes.
   • Check for updates every 6 months—the tool alerts you to new software releases.
5. 5. Check PSA Technical Service Bulletins (TSBs)
   • Access Service Data > TSBs > Intake System on the CR MAX BT. Many PSA models (e.g., 2019–2021 Citroën C4) have TSBs for intake manifold gasket replacements to fix recurring DF002-0110.

FAQ: Common Questions About DF002-0110

Summary Table: DF002-0110 Diagnosis & Repair Steps

Final Thoughts

DF002-0110 doesn’t have to be a frustrating, recurring issue. With the iCarsoft CR MAX BT, you can diagnose the root cause (whether it’s a vacuum leak, faulty sensor, or wiring problem) quickly—and avoid costly dealer visits. Its PSA-specific tools, wireless convenience, and real-time monitoring make it the ultimate companion for Peugeot, Citroën, and DS owners.

By following the step-by-step process in this guide, you’ll restore your vehicle’s performance, improve fuel efficiency, and prevent future damage. The CR MAX BT doesn’t just read codes—it empowers you to fix them with confidence.

Don’t let DF002-0110 compromise your PSA vehicle’s reliability. With the CR MAX BT, you have everything you need to keep your intake system healthy and your engine running smoothly for miles to come.