2.7T Throwing some engine and tranny codes. Can anyone help??

[S4Andy]

I just picked up a 2002 2.7t quattro. It's giving me these four engine codes

16502 - Engine Coolant Temp. Sensor (G62): Signal too High
P0118 - 35-10 - - - Intermittent
17887 - Brake Boost Vacuum System: Mechanical Failure
P1479 - 35-00 - -
16815 - Warm Up Catalyst; Bank 2: Efficiency Below Threshold
P0431 - 35-10 - - - Intermittent
16805 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold
P0421 - 35-10 - - - Intermittent

Also the transmission is giving me this one P0741.

I already checked the Ross Tech website for explanations, but don't know exactly what parts should be replaced (what's a warm up catalyst)?

Any help would be greatly appreciated!

Regards,
Andy

[A62TURBO]

VAG1551 Scan Tool Display

VAG1551 scan tool
Possible cause
Corrective action

17125 P0741

ATF level not OK

Faulty or incorrect converter
Check ATF level
=> Repair Manual, 5 Spd. Automatic Transmission 01V, Repair Group 37; ATF-level checking and topping off
Check converter code

Clutch for bridging converter








no power transfer
Pressure control valve 4 -N218- 1) is mechanically faulty

Problems in the ATF-line to pressure control valve 4 -N218- 1)


Converter pressure valve faulty

Torque converter valve faulty






Continuation ▼
Read measuring value block => Page AUDI-C5-AT02-01-012-0101-196; Display group number 007 2) check clutch TC (closed) and permissible torque converter slip
Replace pressure control valve 4 -N218- or valve body
=> Repair Manual, 5 Spd. Automatic Transmission 01V, Repair Group 38; Oil pan, oil strainer and valve body, removing and installing; valve body removing and installing

[A62TURBO]

P1479
17887
Brake vacuum system

Mechanical malfunction
Perform output Diagnostic Test Mode (DTM) in Engine Control Module (ECM) to check whether the vacuum pump runs or is activated
Check hose setup to pump or from the pump to brake booster
Perform a short trip in Engine Control Module (ECM) (basic setting; display group 8 with ignition on and selector lever in "P" or "N")

[A62TURBO]

16815 - Warm Up Catalyst; Bank 2: Efficiency Below Threshold
P0431 - 35-10 - - - Intermittent
16805 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold
P0421 - 35-10 - - - Intermittent

You need new cats?

[A62TURBO]

Did you try clearing the DTC's to see which come back??

[S4Andy]

Thanks for your replies buddy...For the brake vaccuum can I perform the diagnostics myself? What tools/equipment would I need?
Can the cats be hollowed out?
I haven't cleared any codes yet because I wasn't sure how to do that.

Thank you for your help.
Andy

[2.slowT]

I read the title and was worried you were going to say P0741.

Sorry to tell you but you need a new torque converter most likely. I would say its probably a 75%+ chance. Some try to change fluid, as did I, but just wasted 500 bucks.

There is a TON on here and AW about this just search 'P0741'

I know you will ask cost so
- 10-12 hours labor
- 500-850 for the part

- total TC replacement 1400-1800
- dealer prices will be higher

[A62TURBO]

I read the title and was worried you were going to say P0741.

Sorry to tell you but you need a new torque converter most likely. I would say its probably a 75%+ chance. Some try to change fluid, as did I, but just wasted 500 bucks.

There is a TON on here and AW about this just search 'P0741'

I know you will ask cost so
- 10-12 hours labor
- 500-850 for the part

- total TC replacement 1400-1800
- dealer prices will be higher

+1 Mine was changed about 6 months ago, thank God I was still covered under CPO

[S4Andy]

+1 Mine was changed about 6 months ago, thank God I was still covered under CPO

Thanks guys.
Despite all these codes, the car idles, runs and shifts smooth. I'm not too worried. What bothers me the most is the cats rattling. Does this have pre and post cats? Has anyone ever hollowed theirs out?
Do you guys know how hard it is to change the coolant temp sensor?
Thanks again,
Andy

[A62TURBO]

Thanks guys.
Despite all these codes, the car idles, runs and shifts smooth. I'm not too worried. What bothers me the most is the cats rattling. Does this have pre and post cats? Has anyone ever hollowed theirs out?
Do you guys know how hard it is to change the coolant temp sensor?
Thanks again,
Andy

Trust me, I would be more concerned about the P0741 which means you need a new torque converter, I wouldn't drive the car until a new torque converter is installed because it will lead to needing a new tranny. Worry about this one first and then take care of the rest.

[2.slowT]

Trust me, I would be more concerned about the P0741 which means you need a new torque converter, I wouldn't drive the car until a new torque converter is installed because it will lead to needing a new tranny. Worry about this one first and then take care of the rest.

x2 to that. I love when the common response it im not worried becasue it drives fine.

It will drive fine but your clutches inside the TC are not locking up therefore wearing down, therefore releasing metal parts and such into and throughout your transmission.....

Do you want to fix a TC or TC & Transmission??

Do research and you will be enlightened.

[Eyerate]

+1 Mine was changed about 6 months ago, thank God I was still covered under CPO

Did you also replace the Converter pressure valve? Or just need a new TC?

I'm getting the same code on mine

thanks

[sideways]

I just replaced the torque converter, flushed out the old slug out of the trany and put new ATF from the audi dealer. Its about 5k miles now without any issues.. it seems like this is a common issue for the a6 click here.

16815 - Warm Up Catalyst; Bank 2: Efficiency Below Threshold
P0431 - 35-10 - - - Intermittent
16805 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold
P0421 - 35-10 - - - Intermittent


Your precats are out. you can replace the cats or try the fouler techniques. I tried the spark plug fouler and it was hitting the fire wall. The schmidt wayne angled foulers are the way to go.

The diode and resistor methods to fool the ecu never works. Another option is to reflash the ecu to ignore the secondary o2 sensors.

[A62TURBO]

Did you also replace the Converter pressure valve? Or just need a new TC?

I'm getting the same code on mine

thanks

Only the TC got changed as it was the only thing affected.

[Pearl_2.7T]

P0741...like others have said, you need a new torque converter. I had mine replaced last year, it cost roughly $2000 at my local independent shop. The car will shift just fine, however the transmission isn't catching, if you continue to drive with your current TC you're going to end up ruining your entire transmission.

Best of luck

- Jared