esayem
Member
Hi all,
Posting this here so others can find it if needed.
This job is a bit fiddly but fairly straightforward, and took me (a semi-competent DIYer) just under an hour.
Tools required:
1) Remove the marked 10 mm bolts - two holding the plastic cable guide, three holding the exhaust heat shield. The bottom heat shield bolt is tricky to get at and was the most corroded.
2) Disconnect the heat shield hose.
3) Remove the exhaust heat shield - it pulls up and out of the engine bay. This will expose the lambda probe.
4) Slide the lambda probe electrical connector from the metal guide and disconnect it (this is a standard A2 electrical connector clip, push the tab until it clicks then pull the two pieces apart).
5) Remove the lambda probe with the 22 mm spanner. This is the hardest part of the job as the probe will most likely be seized in place. I found a combination of WD40 penetrating fluid, running the engine for a few minutes to get the manifold hot, and tapping the end of the spanner with a hammer eventually loosened the probe.
6) Install the new probe being careful not to twist the wires when screwing it in. Tighten to finger tight + ½ -~ ¾ turns with the spanner (35 ~ 45 nm) as per the probe instructions.
7) Reconnect the probe electrical connector and slide it back into the metal guide. This is a good point to double check the wiring for the probe isn’t twisted.
8) Reinstall the heat shield, hose, and 10 mm bolts.
Extra information:
Thanks for reading,
Sam
Posting this here so others can find it if needed.
This job is a bit fiddly but fairly straightforward, and took me (a semi-competent DIYer) just under an hour.
| Item | Audi part code | Part installed |
| G39 Lambda Probe | 036 906 265 J | NTK NZA11-V1 |
Tools required:
- 10 mm socket (+ wrench and extensions)
- 22 mm open ended spanner
- Dead Blow hammer *optional*
- WD40 penetrant *optional*
1) Remove the marked 10 mm bolts - two holding the plastic cable guide, three holding the exhaust heat shield. The bottom heat shield bolt is tricky to get at and was the most corroded.
2) Disconnect the heat shield hose.
3) Remove the exhaust heat shield - it pulls up and out of the engine bay. This will expose the lambda probe.
4) Slide the lambda probe electrical connector from the metal guide and disconnect it (this is a standard A2 electrical connector clip, push the tab until it clicks then pull the two pieces apart).
5) Remove the lambda probe with the 22 mm spanner. This is the hardest part of the job as the probe will most likely be seized in place. I found a combination of WD40 penetrating fluid, running the engine for a few minutes to get the manifold hot, and tapping the end of the spanner with a hammer eventually loosened the probe.
6) Install the new probe being careful not to twist the wires when screwing it in. Tighten to finger tight + ½ -~ ¾ turns with the spanner (35 ~ 45 nm) as per the probe instructions.
7) Reconnect the probe electrical connector and slide it back into the metal guide. This is a good point to double check the wiring for the probe isn’t twisted.
8) Reinstall the heat shield, hose, and 10 mm bolts.
Extra information:
Thanks for reading,
Sam