Frequently Asked Questions

Q.How do I find a DENSO part number?

DENSO 10 digit part numbers XXXXXX.XXXX are usually engraved or printed onto the label of our parts, alternatively you can search by application make/model using our parts search function.

Q.I've Just bought a DENSO compressor and will be replacing the condenser and receiver drier as well. Do I need to add oil to these new components?

The DENSO compressor will come with the correct amount of oil for the system, but be sure to always follow the car makers fitment and repair procedures.

Q.I am fitting a new DENSO compressor, but the old compressor was leaking some oil. How much oil should I add to the system?

The only way to be sure on the correct oil quantity is to empty the system of oil and fill it with the correct amount. Unfortunately, there is no other reliable method.

Q.Why do all the injectors have the same Compensation Codes?

The new IAM injectors will have the same Compensation Code for that part number injector as they are coded to the same level and unlike OEM injectors, their tolerances are little more forgiving.

Q.When I Code the injectors, I get a P1601 – Eprom Error. What am I getting that code?

That is perfectly normal for that code to show up on your scan tool. All you need to do it to perform the Pilot Learn and then it will sort it out.

Q.I have lost the paper with the compensation code, how can I find the code?

If the part number is the same as the other injectors, you have then you should be able to use the same compensation code for these injectors.

Q.I bought some injectors in a DENSO box, but all the compensation codes are the same. Is this GENUINE?

Yes, are genuine. DENSO have introduced new IAM injectors where you will find the compensation codes to be the same for the same part number injectors.

Q.Do I need to code DENSO AM common rail injectors to my car.

Yes, you do need to code DENSO common rail injectors to your car. These injectors come pre-calibrated and ready for installation. However, it’s essential to ensure that the injectors are compatible with your vehicle’s make and model. Proper installation, including torque specifications and sealing, is crucial for optimal performance. If you encounter any issues, consult a professional mechanic, or follow the manufacturer’s guidelines to ensure a smooth integration into your car’s fuel system.

Q.Can I install a Denso injector myself?

You need to follow proper procedures and safety measures. If you’re not confident or experienced, it’s better to seek A mechanic can ensure a correct and safe installation and prevent any potential issues, incorrect fitment may void your warranty or worse damage your vehicle.

Q.What warranty do your injectors come with?

DENSO typically offers a 12-month warranty on their injectors. This means that if you encounter any issues with your DENSO injectors within the first year after purchase, you may be eligible for warranty coverage.

Q.Why do my Injectors wear?

Common rail injectors can experience wear due for many reasons.
A. High Pressure and Friction: Common rail injectors operate under extremely high pressure (up to 30,000 psi or more). The intense pressure causes wear on critical components like the nozzle needle, control valve, and sealing surfaces. Friction between these parts during injection cycles contributes to gradual wear.
B. Fuel Contaminants: Diesel fuel can contain impurities, water, and particulates. These contaminants can damage injector components, leading to wear. Even small particles can cause abrasion and affect the injector’s performance over time.
C. Coking and Carbon Deposits: When fuel is injected into the combustion chamber, it vaporizes and leaves behind carbon deposits. These deposits accumulate on the injector nozzle, affecting spray patterns and fuel atomization. Over time, coking can lead to wear and reduced efficiency.
D. Injector Timing and Duration: Incorrect injector timing or prolonged injection duration can strain the injector components. If the timing is off, the nozzle needle may not seat properly, causing leakage and wear.
E. Vibration and Heat: Engine vibrations and high operating temperatures can stress injector parts. Vibrations can loosen connections, affecting sealing, while heat can cause material fatigue and degradation.
F. Poor Fuel Quality: Using low-quality or contaminated fuel accelerates wear. Poor lubricity, inadequate additives, or high sulphur content can harm injector surfaces.
G. Injector Seals and O-rings: Seals and O-rings ensure proper sealing between injector components. Over time, these rubber parts can harden, crack, or degrade, leading to leaks and wear.
H. Injector Solenoids and Electronics: Electrical components within the injector, such as solenoids and sensors, can fail due to wear or electrical issues. Faulty electronics affect fuel delivery precision.
I. Injector Aging: Like any mechanical part, common rail injectors age with use. The constant movement of internal components gradually wears them down.
J. Maintenance and Cleaning: Regular maintenance, including cleaning and calibration, helps prevent wear. Neglecting maintenance can lead to premature wear and injector failure.
In summary, wear in common rail injectors results from a combination of high pressure, fuel quality, operating conditions, and aging. Proper maintenance, using quality fuel, and addressing issues promptly can extend the life of these critical components.