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54bhp CDI Exhaust Temp Sensors

Mod Details
PremiumYes Difficulty Mod ID1321 Creditevilution For451 Fortwo Linkhttps://dev.evilution.co.uk/mod/54bhp-cdi-exhaust-temp-sensors.htm Copy to Clipboard

54bhp CDI 451 Exhaust And Turbo Temperature Sensors

The turbo temperature sensor and the DPF temperature sensors are fairly common failures on the 54bhp diesel 451 fortwo. The issue is that the symptoms of a failed temperature sensor were very similar to a failed DPF pressure sensor failure. Thankfully, the temperature sensors are very easy to test to ensure they’re functioning correctly.

Getting To The Sensors

Simple remove the rear panels. Then look at the turbo to find the 1st sensor.

Then loom at the exhaust box to find the 2nd sensor.

Thankfully, you don’t really need to remove them to test them.

The electrical connectors can be seen underneath the engine, on the left side, behind the drive shaft. Disconnect them both and find your trusty multimeter.

Bench Testing The Sensors

Leave the car unused until everything is as cold as the air temperature. Set your multimeter to read ohms. If your test probes aren’t thin enough, use wire or pins pushed into the connector so you can make good contact with both terminals.

At 18 degrees C (the normal temperature of my house), the sensor read 216 ohms. However, when put in freshly boiled water, the multimeter showed 270 ohms.

The important thing is that both sensors read approximately the same resistance. That’s because they are the same sensor at the same temperature. It’s just the housing is different lengths.

What Happens When They Fail?

These types of sensors usually measure a voltage differential between 2 electrodes or the voltage drop across 1 electrode. If there is any damage internally, you are very likely to just get a fixed output from the sensor instead of a variable voltage which is then calculated into a temperature. A fixed temperature ouput doesn’t take long to trip an error with the ECU as it knows there should be change.

Turbo Temperature Sensor

A 008 153 32 28
A 001 905 13 00
A 000 905 15 32

Exhaust Temperature Sensor

A 008 153 25 28
A 000 905 08 32
A 001 905 15 00
A 000 905 58 06
A 000 905 88 05

A 17mm spanner is required to remove the sensor. It is recommended to soak them in penetrating oil before removal

OE Numbers:

0009050832,
0081532528,
0009051732,
A0081532528,
A0009051732,
A0009050832


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