Help bring her back to life, she served me well for 17 years

[KarduciWP]

Evening all,

I'm based in South Africa and own a 2007 Citroën C3 Furio 1.6 Automatic, which I bought new back in 2007. Over the years, the car has proudly served both my daughters during their student years. She's been a real trooper but sadly, the gearbox is now giving trouble.

Unfortunately, spares for the AL4 automatic transmission (also known as DP0, or PSA gearbox code 20TS35) are very limited or unavailable in South Africa.

I'm hoping for advice or leads on:

* A reliable source (locally or abroad) for a working second-hand, reconditioned, or rebuildable AL4 / DP0 / 20TS35 gearbox
* Any trusted UK/EU-based suppliers, breakers, or rebuilders who might have stock or could help locate one
* Suggestions on interchangeable gearboxes from other PSA models (Peugeot 206/207/307)

If you’re in the UK or EU and know someone who can supply one**, I’d also really appreciate any guidance on how to arrange cross-border shipping to South Africa or if someone has experience shipping bulky items like gearboxes internationally, I’d be grateful for your insight.

Thanks in advance for any help you can offer!

Kind regards,
Conrad

[xantia_v6]

Do you know what is wrong with the transmission? Do you believe it to be repairable? Exactly which engine does the car have? (it may effect transmission interchange)

[KarduciWP]

Hi, thanks for the interest.
Detail Value
Make Citroën
Model C3 I (Facelift)
Engine NFU 1.6L 16V Petrol (TU5JP4)
Gearbox DP0 / AL4 / 20TS35
I have to go with the mechanic diagnostics that they are trying to get a replacement gearbox as it might be less expensive than a rebuild.
I do not have much trust in the technical feedback from mechanic.
Every where I do enquieries in South Africa seems to be very negative in attempting to repair the Citroen gearbox. (Other than the Citroen dealer that I have not contacted who I think prefers that I buy a new Citroen).
The norm in South Africa seems to break these cars up for parts. Just very difficult to find a parts car with the AL4 compatable gearbox.

[ozvtr]

What exactly are the symptoms?
No disrespect, but if you don't trust the feed back from the mechanic, how can you trust them to fix it?
Do they have a scan tool that will read the error codes from the gearbox? If so what are the codes? If they cant read the codes how do they know what's wrong? Or is replacing the gearbox the only thing they can do?
There are a few things that fail on the AL4 that can be fixed relatively easily. However a common failure is worn out brake bands which require a gearbox strip down.

[KarduciWP]

Thanks everyone for the feedback and follow-up questions. I’ll try to respond as clearly as possible:

What exactly are the symptoms?

She started not going into gear, especially when going uphill, and behaved like a slipping clutch. With gentle throttle, I managed to limp her to the workshop. Most likely drive-related, not engine.
No strange noises, just a failure to engage and transfer power properly.

Re: trusting the mechanic
No disrespect taken, it's a fair question especialy if me, the owner/client is not a mechanic. So I can only answer it from a owners experience perspective.
Initially, I approached the workshop in good faith. But over time, the confidence eroded due to inconsistent communication.
It started with over a week of “diagnostics,” vague updates like “we’ve found a gearbox, will quote soon,” followed by basic questions like “what year model is this?” after the quote had already been sent. That’s when I became concerned.

Re: Diagnostics and fault codes
I visited the workshop in person to discuss the quote. The owner was transparent and admitted they were struggling to read the gearbox ECU,likely due to compatibility issues with older PSA models.
He projected confidence and professionalism, so I even expanded the job to include:

* Timing belt service
* Suspension (shocks, bushings)
* Brake discs and pads
* Oil Leak and Seal
Basically a major service +size

Re: AL4 strip-down and brake band failure
The manager later admitted they couldn't source a suitable replacement gearbox. Then proposed a manual conversion, but this added 30% more to the cost.

* What started as a R15,000 job grew to R30,000 with the added work
* The "manual conversion" quote pushed it to R52,000
At that point, I said I’d lost confidence in spending more without a guaranteed result.

We agreed they would complete the service work already commissioned, reinstall everything, and leave only the gearbox issue outstanding. I would then remove the car and search help searching for a gearbox and when found we can continue. In so I freed up his vehicle lift that was occupied for more than 4 weeks by then.

Vehicle condition on return

On first inspection, I saw several parts were missing or not reinstalled. The service manager apologised and blamed the technician.
On the second attempt, all visible components seemed to be back in place, and the car started and ran fine (minus transmission function). I confirmed that the other job card items were completed and removed the car from their premises. (Paid R24000 by then)
Just to mention, one can by a running C3 of simmilar years for R59,000. This 1.6 Automatic is a lovely model and so I was hoping to for the same price I would at least have the confidence that I will get her running for the same cost.
So after more than 4 weeks in the shop, I now have a serviced but non-running C3, parked at home while I try to find a replacement AL4/DP0/20TS35 gearbox or repair solution.

Thanks again for the support and feedback. I’m still keen to repair her she’s part of the family.
Any further advice on sourcing and importing to South Africa a known-good used or reconditioned AL4 gearbox and/or a trusted local rebuilder would be hugely appreciated.

[ozvtr]

Unfortunately it could be a number of things.
Could be oil pump, pressure modulator valve, pressure sensor, clutch pack or brake bands. Sounds like a loss of hydraulic power.
Do you get 3 beeps, the snow flake (*) and 's' flash on the dash?
Unfortunately, without the error codes there is no place to start.
It seems that even if we could nail down the fault, you don't have anyone to help you.

[Gibbo2286]

Have you tried the automatic transmission specialists instead of the bog standard garages?
There seem to be many in SA, perhaps you can find one that has experience with the Citroen stuff. Ask around.

Here are some a quick google found:

https://www.mayfairgearbox.co.za/

https://all-o-matic.co.za/

https://www.executivetransmissions.co.za/

[KarduciWP]

Your guidance has helped a lot and I have located the following diagnostic codes and some short possible description.
Code Module Meaning Impact
P3A3A Transmission ECU (BVMP_MA) Gear engagement/hydraulic fault Critical gearbox issue
P0501 Engine ECU (ME745 & J34P) Vehicle Speed Sensor fault Could affect shifting logic

Possible unrelated
P2202 Transmission ECU (BVMP_MA) NOx Sensor circuit low Likely unrelated

[xantia_v6]

For interchange of the transmission with other PSA vehicles, it is safe to fit a transmission of the same part number.
You should only try to fit a transmission from a similar engine (or at least a different TU engine. Transmissions with different part numbers may have had the speedo sensor present or deleted.
The other important differences are the final drive ratio (usually 20x73 or 21x73) and the reduction ratio (52x67 is one example of this, but I am not sure which ratio your transmission has here).
There may be a big spreadsheet with the options for all the variants of AL4, but I have not found it.
You may be able to fit a transmission with different ratios if you fit the matching ECU, but beware that there maybe issues with compatibility of a different transmission ECU with the rest of the car systems.
I also just found that some have driveshafts with 23 splines and some have 26.