VW Passat B7 2.0 TDI (2015)
4× injector IMA + SRA
TW3 · Hounslow
Arrived 30 min · finished 85 min
£129 fixed
New Bosch injectors fitted by a local garage without coding — engine ran rough until codes written and SRA completed.
Mobile Diagnostics · UK Wide ///
Injector Coding & IMA Calibration. From £79 · Mobile · Same-Day
Just fitted new common-rail diesel or GDI petrol injectors and the engine sounds rough? Mobile injector coding and Smooth Running Adjustment on your driveway from £79. Bosch IMA, Delphi C2I, Denso, Continental — every UK platform supported. Fixed price.
30-min response
West London
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Public & PI
Non-destructive
Industry standard
Dealer-level kit
AutoTuner · Autel
Fixed quotes
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Modern fuel injectors are precision-machined to flow within a tight tolerance band. The exact deviation of each injector from the nominal flow rate is etched on the body as a code — Bosch IMA (Injektor Mengen Abgleich), Delphi C2I/C3I, Denso QR code, Continental short-trim code — and that code has to be written into the ECU's injector table so the engine knows how much fuel each cylinder will actually deliver from a given pulse-width. Skip the coding step and the engine runs rough, the EML comes on, fuel economy drops 15–30%, the DPF clogs faster and the customer's £400 set of new injectors looks like a waste of money. Coding takes 15 minutes per engine with a dealer-grade scan tool. We do it on the driveway.
- Fixed-price injector coding from £79 — no call-out fee
- Bosch IMA, Delphi C2I/C3I, Denso QR, Continental — all supported
- Smooth Running Adjustment (IMA quantity correction) included
- Per-cylinder fuel-trim balance after coding
- Cylinder contribution test before & after
- Suitable after injector swap, ECU reflash or injector cleaning
- Most jobs done in 30–60 minutes on the driveway
- 12-month warranty on the coding work
Symptoms We Diagnose
Warning Lights & Symptoms We See Most.
These are the symptoms our customers describe when they book injector coding & ima calibration. If yours matches one of these, we can usually clear the fault and code/calibrate the affected module on site — no garage drop-off, no waiting list.
Engine sounds rough or rattly after new injectors fitted
EML on with P0263 / P0266 / P0269 / P0272 cylinder-balance code
Misfire DTC on one or more cylinders post-replacement
Excessive black smoke from the exhaust under acceleration
Fuel economy worse than before the injector job
DPF regeneration interval shortened drastically
Engine hesitates or surges at idle
Limp mode triggered shortly after the engine warms up
Knocking sound from one cylinder at idle
Glow plug / EML pair flashing on cold start
Common Causes & What We Check.
Most injector coding & ima calibration jobs trace back to one of a handful of root causes. We work through them in order, using a dealer-grade OEM-spec scan tool, a multimeter and a road-test — not a code-reader and a guess.
Old injector codes still in the ECU (most common)
When new injectors are fitted, the ECU still uses the previous injectors' calibration values until the new IMA codes are written. The actual fuel delivery doesn't match the assumed fuel delivery and the engine runs rough. A 15-minute coding routine fixes it.
ECU reflash wiped the injector table
Some remappers reset the injector calibration table back to nominal values. If the injectors are not nominal (and almost none are) the engine runs rough until the etched codes are re-written. Standard part of every reputable remap job — we do it free for any car we remap.
Wrong IMA code typed in
A single transposed digit in a 7- or 9-character IMA code can give worse running than not coding at all. We re-read the actual etched codes from the injector body and re-enter from scratch.
Cylinder contribution out of balance after refurb
Refurbished injectors can drift outside their original tolerance even with the original code. We run the cylinder contribution test live and re-balance via Smooth Running Adjustment if any cylinder is contributing too much or too little.
Failed injector among the new set
Roughly 1 in 50 brand-new aftermarket injectors arrives DOA. Coding will not save a dead injector — we test each cylinder's contribution and identify a faulty unit before condemning the rest.
Glow plug or compression fault confused for injector trim
On cold-start the symptoms can look identical. We test compression and glow-plug resistance as part of the diagnostic so we don't waste a coding session on the wrong root cause.
Our On-Site Diagnostic Process.
Every injector coding & ima calibration job follows the same six-step process. No skipping steps to save time, no upselling a part you don't need.
- 1Pre-coding scan & smoke check
Read all DTCs, watch live injector pulse-width and cylinder contribution. Confirm injectors are physically the right type for the engine.
- 2Verify etched IMA / C2I / QR codes
Cross-check the codes printed on the injector body against any paperwork supplied with the parts. Photograph for record.
- 3Write codes via dealer-grade scan tool
Bosch EDC15/16/17/17C, Delphi DCM, Denso, Siemens / Continental — coded via VAG ODIS, BMW ISTA, Mercedes XENTRY, JLR SDD, Ford IDS, GM MDI, Toyota Techstream.
- 4Run Smooth Running Adjustment (IMA quantity)
ECU-led routine that fine-trims fuel delivery on each cylinder at idle. Required on most VAG, BMW and Mercedes diesels after coding.
- 5Cylinder contribution & live trim re-check
Live data verification — every cylinder should contribute within ±2 mg/stroke of the others at warm idle. We don't hand back until it does.
- 6Road-test & adaptive learn
Short road test to let the long-term fuel trims and DPF differential-pressure baselines re-learn against the new injectors.
Injector Coding & IMA Calibration Pricing · Fixed, Not Hourly.
Every price below is fixed and includes the on-site visit, the scan, the diagnosis report and any coding/calibration needed to clear the fault. Parts (if required) are quoted separately before any work starts.
Injector Coding (1 cylinder)
Single IMA / C2I code write
£7930–45 min
Injector Coding (full set)
All 4–8 codes + SRA + verify
£12945–75 min
Smooth Running Adjustment
Per-cylinder trim balance at idle
£8930–45 min
Cylinder Contribution Test
Diagnose rough running pre-job
£7930–45 min
Post-Remap Injector Re-code
Recover trims after ECU flash
£9945–60 min
DPF Differential Re-baseline
Adds DPF learn after injector job
£5920–30 min
Out-of-hours surcharge £30–£50 (before 09:00, after 18:00, weekends & bank holidays). All prices include VAT.
Vehicles & Platforms We Cover.
Our vans carry OEM-spec scan tools for every modern UK-market platform. Below is a snapshot of the makes and platforms we handle for injector coding & ima calibration.
VW · 1.6/2.0 TDI (EA189 / EA288), 1.4/1.5/2.0 TSI
Audi · 2.0 TDI, 3.0 TDI V6, 2.0 TFSI, 3.0 TFSI
Skoda, SEAT, Cupra — full VAG diesel & TSI range
BMW · N47, B47, N57, B57 diesel · N20, B48 petrol
Mercedes-Benz · OM651, OM654, OM656, OM642
Ford · 1.5/2.0 TDCi (Duratorq), 1.0/1.5 EcoBoost
Vauxhall · 1.6/2.0 CDTi, 1.4/1.5 turbo petrol
Land Rover · 2.0/3.0 SDV6, 3.0 TDV6, 5.0 V8 SC
Jaguar · 2.0d AJ200, 3.0 V6 AJ126, 5.0 V8
Toyota & Lexus · 1.6/2.0/2.4 D-4D · 2.0/2.5 D-4S petrol
Honda · 1.6 i-DTEC, 1.5 VTEC Turbo
Hyundai, Kia · 1.6/2.0/2.2 CRDi, T-GDI petrol
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Real Customer Work
Recent Injector Coding & IMA Calibration Jobs
Real injector coding & ima calibration jobs completed on the driveway in recent weeks — vehicle, postcode, on-scene time and fixed price. No stock photos.
BMW 320d F30 (2017)
Single cylinder injector code
W5 · Ealing driveway
Arrived 33 min · finished 60 min
£79 fixed
Cylinder 3 injector replaced under warranty — coded via ISTA-equivalent, P0263 cleared, no return fault.
Mercedes E220d W213 (2019)
Full OM654 injector coding
SL1 · Slough
Arrived 26 min · finished 75 min
£129 fixed
Dealer wanted £380 for the same job — we did it on the driveway with XENTRY-equivalent in 75 min.
Ford Focus Mk3 1.5 TDCi (2018)
Post-remap injector re-code
RG1 · Reading
Arrived 35 min · finished 70 min
£99 fixed
Stage 1 remap had reset the injector table. Re-read from injector bodies and re-coded — rough running cured.
Land Rover Discovery 4 3.0 SDV6 (2016)
6× injector coding + DPF re-baseline
TW6 · Heathrow
Arrived 28 min · finished 110 min
£189 fixed
All six injectors replaced for cracked nozzles. Coded, SRA run, DPF differential re-baselined for clean regen.
Injector Coding & IMA Calibration — Questions
What is injector coding and why do I need it?+
Every modern diesel and most GDI petrol injectors are etched with a calibration code (IMA, C2I, QR or short-trim) that tells the ECU exactly how much fuel that specific injector will deliver. Without writing the new codes after replacement, the ECU uses the old values, fuel delivery is wrong, the engine runs rough, fuel economy drops and the EML comes on. Coding takes 15 minutes per engine.
How much does injector coding cost?+
£79 for a single injector. £129 for a full set (4, 6 or 8 cylinders) including Smooth Running Adjustment. Both include the on-site visit, dealer-grade scan, coding, verification and 12-month warranty on the coding work.
Can I drive without coding new injectors?+
Mechanically yes, but the engine will run rough, fuel economy will drop 15–30%, the DPF will clog faster, the EML will come on and (on most modern platforms) the ECU will eventually go into limp mode. We strongly recommend coding at the same visit as the injector job.
Will a generic code reader code my injectors?+
No. Injector coding is a service-level routine, not a code clear. It needs a dealer-grade scan tool with bidirectional access to the ECU's injector calibration table — VAG ODIS, BMW ISTA, Mercedes XENTRY, JLR SDD, Ford IDS, etc. Generic OBD readers cannot perform it.
What is Smooth Running Adjustment?+
After the static IMA codes are written, most modern diesels run an additional dynamic trim routine called Smooth Running Adjustment (Mengenabgleich on VAG, Injection Quantity Balance on BMW). It fine-tunes fuel delivery per cylinder at idle until contribution is within ±2 mg/stroke. Standard part of our injector coding job.
Does this work on petrol injectors too?+
Yes — direct-injection petrols (TSI/TFSI, MultiAir, EcoBoost, T-GDI, D-4S) use short-trim codes that work the same way as diesel IMA. Port-injected (older multi-point petrol) engines don't need coding.
Can you do this after a remap?+
Yes — and we strongly recommend it. Many remappers reset the injector table to nominal values, which causes rough running on engines with non-nominal injectors. We re-read the etched codes from the injector bodies and re-write them in 45–60 minutes for £99.
Do I need to do anything before you arrive?+
Keep the car off the driveway gravel if possible (we need flat ground for the engine-running portion). Have your V5 logbook ready. If you have the original injector paperwork or photos of the codes, bring them — but we re-read from the bodies anyway.
Why Drivers Choose StageMyCar For Injector Coding & IMA Calibration
Most injector coding & ima calibration faults aren't a "swap the part and hope" job — they're a coding, calibration and adaptation problem. A high-street garage with a generic OBD reader can pull a fault code but often can't write the calibration data back to the module after a repair, which is why so many customers tell us the warning light came back the next morning. Our vans carry dealer-grade tooling for every UK-market platform, so the calibration that clears the light isn't a separate dealer trip — it's part of the same fixed-price visit.
We attend driveways, workplaces, supermarket car parks, airport long-stays and roadside breakdowns across London, the M25 corridor and the M3/M4/M40 commuter belt. Fixed price quoted on WhatsApp before we attend; cards, cash, bank transfer and Payment Assist (3–4 monthly instalments on jobs over £250) all accepted; 12-month warranty on every job.
Related diagnostics: Car Diagnostics Hub · Auto Electrical · ECU Fault Diagnosis · Mobile Diagnostics West London · Car Diagnostics Near Me
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