AJ Tuning covering Newcastle, Gateshead, Washington, Sunderland and all the North East of England offering reliable, software-based solutions for AdBlue, DPF, and EGR systems — tailored to your specific vehicle. Whether you’re dealing with a fault, looking to optimise performance, or preparing a vehicle for off-road or motorsport use, our custom services provide dependable results
DPF, EGR & AdBlue Solutions
Modern diesel engines are fitted with systems such as DPFs (Diesel Particulate Filters), EGR (Exhaust Gas Recirculation), and AdBlue injection to meet emissions standards. While important for the environment, these components can often lead to expensive faults, reduced performance, and poor fuel economy we at AJ Tuning offer a ecu solution to get rid of the fault without effecting the vehicles daily performance.
DPF Solutions
DPF delete we cover Newcastle, Gateshead, Washington, Sunderland and all the North East of England at your home ,works, are at our premises.
Software recalibration to remove DPF function
No more warning lights, limp mode, or forced regeneration
Just contact us for a fast and cheaper solution.
Common DPF Error Codes
- P2002 – Diesel Particulate Filter Efficiency Below Threshold: This code indicates that the DPF is not functioning efficiently, likely due to excessive soot buildup. Solutions include performing a highway drive to initiate proper regeneration or cleaning the DPF. 1
- P242F – Diesel Particulate Filter Regeneration Incomplete: This code suggests that the DPF regeneration process did not complete successfully. Underlying issues such as faulty sensors or exhaust leaks may need to be addressed. 2
- P2463 – Diesel Particulate Filter Restriction – Soot Accumulation: This code indicates that the DPF is becoming restricted due to excessive soot accumulation. Similar to P2002, solutions include performing a highway drive or cleaning the DPF. 1
- P2452 – Particulate Filter Differential Pressure Sensor Malfunction: This code indicates a malfunction in the differential pressure sensor, which monitors the pressure difference across the DPF. 1
- P2458 – Particulate Filter Regeneration Maximum Regeneration Time Exceeded: This code indicates that the DPF regeneration process has taken too long, which may suggest a blockage or malfunction.
EGR Solutions
EGR valve software solution we cover Newcastle, Gateshead, Washington, Sunderland and all the North East of England.
Stops carbon build-up and recirculation faults
Improves combustion
Fault Codes? Warning Lights? We’ve Got the Fix.
Restore reliability and performance with our expert DPF, EGR & AdBlue solutions. Whether you’re experiencing limp mode, error messages, or just want a cleaner, more efficient engine setup, we offer custom software solutions across the north east of England built for your specific vehicle.
🔧 Introduction: What the EGR Does and Why It Fails
The Exhaust Gas Recirculation (EGR) valve recirculates a portion of exhaust gases back into the intake to reduce nitrogen oxide (NOx) emissions. Over time, the EGR system can clog with carbon, causing:
- Hesitation
- Poor idle
- Smoke
- Reduced fuel economy
- Engine warning lights
This guide shows you how to diagnose and confirm EGR issues using OBD diagnostics, live data, and physical inspection.
🧪 Step 1: Recognise Symptoms of a Faulty EGR Valve
🔍 Common Symptoms:
- ⚠️ Check Engine Light
- 🐢 Loss of low-end power or throttle lag
- 💨 Excessive black smoke on acceleration
- ⛽ Increased fuel consumption
- 🔀 Rough idle or surging
- 🚫 Engine stalling at low speeds or cold starts
Diesel engines are more prone to EGR clogging due to soot-rich exhaust.
🔍 Step 2: Scan for EGR-Related Fault Codes
Use a scan tool and look for common EGR codes:
| Code | Description |
|---|---|
| P0400 | EGR flow malfunction |
| P0401 | EGR insufficient flow detected |
| P0402 | EGR excessive flow |
| P0403 | EGR circuit malfunction |
| P0404 | EGR range/performance |
| P1401/P1402 | EGR pressure sensor or valve stuck |
Record freeze-frame data when possible to identify load/RPM at time of fault.
📊 Step 3: Monitor Live EGR Data
Most scan tools can show:
- EGR valve position (%) — commanded vs actual
- EGR duty cycle or PWM (pulse width modulation)
- Mass airflow sensor (MAF) readings — EGR flow affects these
Normal EGR Operation:
- EGR closed at idle and WOT
- EGR opens during part throttle (cruise)
- Actual and requested EGR position should match within ±10%
If the valve is stuck open, airflow drops and smoke increases.
If stuck closed, NOx emissions rise and codes trigger.
🔧 Step 4: Inspect and Test the EGR Valve
Types of EGR Valves:
- Vacuum-operated: test with hand vacuum pump
- Electronic (stepper motor): observe position response with scan tool
- Electric with position feedback sensor: test resistance or voltage range
Manual Checks:
- Remove valve and check for carbon buildup or sticking plunger
- Inspect EGR pipe for clogging or cracking
- Test vacuum supply (for older systems) — should hold steady
🛠️ Step 5: Clean, Repair, or Replace?
✅ Cleaning:
- Suitable for moderate carbon buildup
- Clean valve and passages with EGR-safe cleaner
- Only if valve still moves freely and sensors function
🔄 Replacement:
- Required if:
- Valve is electronically unresponsive
- Sticking returns quickly after cleaning
- Position sensor faulty or out of spec
Always clear codes and perform readaptation or relearn after refit.
🚫 Step 6: Don’t Be Fooled by Related Faults
EGR issues can mimic other faults or trigger chain reactions:
| Misleading Symptom | Check |
|---|---|
| Rough idle | MAF sensor contamination from EGR gases |
| Smoke | Overfuelling due to closed-loop fault from stuck EGR |
| Turbo lag | EGR open under load disrupting boost |
| Code P0101 (MAF) | Could be EGR airflow affecting sensor readings |
Always confirm that EGR movement and response are correct before replacing unrelated parts.
🧾 Prevention Tips
- Use premium diesel fuel and add an occasional cleaner
- Perform long motorway runs to trigger natural EGR cleaning
- Ensure MAP and MAF sensors are clean and functioning
- Avoid excessive short trips that increase soot loading
DPF-equipped vehicles depend on a clean EGR system for proper regeneration cycles.
📍 EGR Diagnosis and Repair at Precision Remaps
At Precision Remaps, we:
✅ Perform full EGR system diagnostics
✅ Log EGR valve movement and sensor response
✅ Offer EGR valve cleaning or safe replacement
✅ Tune with EGR systems fully functional and MOT-compliant
✅ Advise on long-term solutions without illegal delete/removal
✅ Diagnostic Summary
- EGR faults cause rough idle, hesitation, smoke, and fault codes
- Use OBD tools to log valve movement, flow behaviour, and MAF response
- Clean or replace depending on condition and electronics
AdBlue Solutions
Permanent AdBlue Delete
AdBlue system deactivation solution we cover Newcastle, Gateshead, Washington, Sunderland and all the North East of England.
No more refilling or system fault codes
Ideal for fleets and high-mileage users
The presence of an AdBlue countdown, the red urea light, or reduced engine power signals a major fault that requires an expert, permanent fix. At AJ Tuning, we specialise in providing the definitive solution: a professional AdBlue Delete and AdBlue Removal service in Newcastle, Gateshead, Washington, Sunderland and all the North East of England. Performed exclusively via ECU software programming. We bring our mobile workshop directly to your location, eliminating the need for towing and guaranteeing a permanent resolution to system failures across the North East UK.
Our methodology is based on completely deactivating the Selective Catalytic Reduction (SCR) system within your car or van’s Engine Control Unit (ECU). This sophisticated software permanently eliminates the faulty component errors, instantly providing the necessary AdBlue Countdown Fix. We guarantee that faults caused by crystallisation, pump failure, or a failing NOx sensor will never trouble you again in Newcastle, Gateshead, Washington, Sunderland and all the North East of England.
AJ Tuning provides fast, reliable mobile coverage in Newcastle, Gateshead, Washington, Sunderland and all the North East of England. We only service cars and vans. If you need a permanent fix, including specialised urea repair for compatible models, contact us for a permanent, lifetime-warrantied AdBlue Delete solution.
Common AdBlue fault codes:
- P20E8 Reductant Pressure Too Low: DEF pump failure, clogged DEF filter, low DEF level.
- P20E9 Reductant Pressure Too High: Blocked DEF injector, faulty DEF pressure sensor.
- P20EE SCR NOx Catalyst Efficiency Below Threshold: SCR catalyst failure, poor quality DEF, NOx sensor fault.
- P204F Reductant System Performance: DEF quality issues, DEF injection system problems, SCR catalyst issues.
- P207F Reductant Quality Performance: Contaminated DEF, improper DEF concentration, sensor issues.
- P203B Reductant Level Sensor Circuit Range/Performance: Faulty DEF level sensor, wiring issues, low DEF level.
- P203C Reductant Level Sensor Circuit Low: DEF level sensor failure, wiring problems, low DEF level.
- P203D Reductant Level Sensor Circuit High: DEF level sensor issues, wiring or connector problems.
- P2047 Reductant Injection Air Pressure Sensor Circuit: Faulty air pressure sensor, wiring issues, air supply problems.
- P2048 Reductant Injection Air Pressure Sensor Circuit Low: Sensor failure, wiring issues, air supply problems.
- P2049 Reductant Injection Air Pressure Sensor Circuit High: Sensor failure, wiring issues, air supply problems.
- P205B Reductant Tank Temperature Sensor Circuit Range/Performance: Faulty temperature sensor, wiring issues, sensor malfunction.
- P205C Reductant Tank Temperature Sensor Circuit Low: Temperature sensor issues, wiring or connector problems.
- P205D Reductant Tank Temperature Sensor Circuit High: Possible Causes: Sensor issues, wiring or connector problems.
- P206A Reductant Quality Sensor Circuit: Faulty DEF quality sensor, wiring issues, contaminated DEF.
- P206B Reductant Quality Sensor Circuit Range/Performance: DEF quality sensor failure, wiring or connector problems.
- P206C Reductant Quality Sensor Circuit Low: DEF quality sensor issues, wiring or connector problems.
- P206D Reductant Quality Sensor Circuit High: DEF quality sensor issues, wiring or connector problems.