Td5 MAF Sensors – Diagnosis & Best Replacements

A properly working Td5 MAF sensor (mass air flow sensor) is critical for smooth running, power and decent fuel consumption. On the Td5, the MAF sits in the air intake and tells the ECU how much air is actually entering the engine so it can control fuelling and boost correctly.

This page pulls together all of our Td5 MAF sensors and related parts in one place, along with some simple guidance on when to suspect the MAF and how to choose a replacement.

For most Td5 owners we recommend the Delphi MHK100620G Td5 MAF sensor as the best balance of correct readings, reliability and price.

When to suspect the Td5 MAF sensor

A tired or failed Td5 MAF sensor can cause:

• Lack of power, especially above about 2,000rpm
• Hesitation or jerking on light throttle
• Flat spots when accelerating
• Excessive smoke under load
• Poor fuel economy

If unplugging the MAF temporarily makes the engine feel better, that’s a strong hint the sensor is giving bad readings and needs to be replaced.

Testing a Td5 MAF sensor

The best way to confirm a failing MAF is with live data (Nanocom, Hawkeye, etc.) or logging on the road. Airflow should rise smoothly with engine speed and load – wild spikes or very low readings at higher revs usually point to a bad sensor.

For a quick driveway check you can also:

• Inspect the connector and wiring for oil or corrosion

• Make sure the air filter and intake pipework are in good condition

• Try unplugging the MAF and seeing if drivability changes

If you’re not sure how to interpret your readings, feel free to get in touch – we work on Td5s every day and can talk you through it.

Choosing the right Td5 MAF sensor

There are three broad types of Td5 MAF you’ll see online:

1. VDO / Continental sensors
Historically these have always been the “go to” sensor, however they are no longer produced.

2. OE-brand replacements (our recommendation)
After testing many different sensors in our own vehicles and customer trucks, we’ve settled on the Delphi MHK100620G Td5 MAF sensor as our go-to replacement. It’s an OE-brand part with a proper dual-element hot-film sensing strip inside – very similar to the original design – and it logs correctly on diagnostic tools.

3. Cheap pattern copies
There are lots of very cheap Td5 MAFs around. Many use a much simpler single probe element inside the housing; they still send a signal to the ECU, but the airflow readings are often miles off, causing flat spots, odd fuelling and in some cases making the engine run worse than before.

All the sensors listed on this page are ones we would actually fit to our own vehicles – no £15 lottery specials.  We do list a budget version – this is an Allmakes 4×4 brand and does actually read ok but we can’t comment on longevity.

What you’ll find on this page

Below you’ll see our current selection of Td5 MAF sensors and related parts:

• Delphi MHK100620G Td5 MAF sensor – our workshop-tested choice for Defender and Discovery 2 Td5

• Any alternative quality-brand sensors we’re happy to supply

• Supporting parts such as MAF connectors or gaskets, where applicable

If you’re unsure which part is right for your Defender or Discovery 2, or want help diagnosing a fault before you buy, just drop us a message – we’d rather you fix the actual problem than throw parts at it.