pugface

Follow up in case someone has the same issue - changing the relay didn't do anything either. I did read where some owners got this code and it turned out to be the ground wire. Mine seemed fine, but I took it off, cleaned it up, and re-snugged it. After that, I was able to run the pump in test mode. So far, CEL has not come back!

Thanks for your help, Loren

Thanks Loren! 

OK, I'm back. I would like to know why these things are closely guarded secrets to Porsche 

I pulled the fuse and checked it - it was fine. Cleaned it off, put it back, cleared the codes. Of course the code is back a week later, since I didn't fix anything, but I always hope...

My wiring diagram shows a SAI relay in the plenum box, my parts catalog shows relays in the plenum box, but I can't find where the relay is, or exactly which is the SAI relay

I found some Audi Q5 info on the plenum box (which appears to be physically identical) which shows it as position 'C', which would be Relay position 3 on the Macan. Don't know how confident I am in that, though.

Does anyone happen to know either where the SAI relay is, or what its part number is?

Thanks

Sam

Hi all

ON a 2016 Macan Turbo - where is the fuse for the secondary air injection pump? I'm getting a P0411 code, pulled SAI pump and it tested good with 12V. Thinking maybe fuse is gone, but I don't see it in the owner's manual. That shows 3 fuseboxes, passenger and driver dash right inside the door, and one in the trunk

It looks like there's something underneath the kick panel?

Thanks

Sam

Thanks, I'll see if my indie can do it

On 6/17/2023 at 10:25 AM, Loren said:

Each ECU must be programmed to the car - no straight swaps.

Thanks Loren

When I got the extra ECU, I sent it and my original out to a service that clones the entire ECU - VIN and immobilizer data too, so I now have 2 identical ECUs that can be swapped. Can I ask why you suspect the ECU and not the harness?

Thanks

Sam

10 hours ago, Loren said:

Did anyone try to reprogram the ECU?

I would certainly do that before buying a new or used ECU.

Thanks for the reply!

I don't think so. Honestly I'm much more familiar with non-automotive electronic control systems (my day job) than fixing cars. Is this basically re-flashing the program memory of the ECU? I don't think that has happened. Is that a dealer-only thing? Used ECU is actually very cheap, probably because they are one of the easiest things for a dismantler to remove and they don't seem to break very often.

The working theory was that one of the inputs on the ECU module went bad, so I swapped with a known good one - or at least close to "known good". It did work fine for several months. Since I've swapped the ECU and the O2 sensor, I was leaning towards the wiring harness. 

Shoot, I meant to explain this part better:

In Sep. 2022, I had the P0050 code, and my local shop replaced the sensor. The code came right back, they hypothesized that the problem was on the ECU end, said might not be worth the cost to fix. I sourced an ECU from eBay, and had my existing ECU cloned to it. When I installed the clone ECU, the CEL came right back again. This time the shop warrantied the sensor and replaced it again. On my way home from that, the CEL came on again!

2006 Cayenne Turbo S   -              214,000 miles

Hi all, I am trying to chase down some CELs and rough running.

A little history - all O2 sensors replaced in 2016

03/2018                P2629    - shop cleaned up harness, CEL went away

12/2020                P2629   shop replaced sensor

09/2022                P0050    shop replaced sensor

10/2022                P0050    ECU swap

10/2022                Sensor replaced in case it was faulty

10/2022                CEL came on, this  time I cleaned up the harness myself

12/2022                P2629    P2247 P2A03 - cleaned up harness

05/2022                P0431, P0155, P2A03

06/2022                Car went to shop for something else, they saw the problem, but on reconnecting the battery, it was OK again

06/2022                CEL came on way home from shop ☹ P2189 P0150

I cleared the codes again, drove it yesterday, it started to idle very roughly and shudder on acceleration.

Drove into town again today, the CEL came back, now with a bunch of codes

P1133 P2179 P2189 P0150

along with

P0300 and P0307 misfires

This is all looking like Bank 2 sensor 1. That is the driver’s side upstream, correct? The 6-wire plug?

With the multiple sensor swaps, and the ECU swap, I would think the logical suspect is the harness.

Does anyone know where the sensor wires end up on the ECU side? I’m thinking I should ring all 6 wires out on a meter and make sure the harness is OK

Any other ideas?

Thanks,

pf