I own a 2002 Seat Leon TDI SE 110BHP and have had it for several years. It has always been serviced at a main dealer and has been totally reliable.
It has now covered 117000 miles and Mass Air Sensor recently failed. I changed this part with a 3rd party replacement from GSF. The typical symptoms of loss of power, no turbo etc were corrected, but I have been left with an annoying misfire.
If I pull away from a junction and change into second I get a misfire between 1800 and 2000 rpm the engine/turbo makes an ?Err, Err, Err sound. After I pass 2000 rpm the car drives OK, if a little rough.
I have found if I start the engine and rev pass 2000 rpm the car will drive smother between this rev range.
I have changed the air filter, engine temperature sensor, fuel filter and the N75 valve. I have also run several tank fuels of fuel system cleaner through the engine. A Seat main dealer has also reset the ECU.
I would really appreciate any help with this problem.
Many thanks
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Ricardo
Sorry to say; but I've never had any success with pattern/counterfeit MAFs. The real thing is surprisingly sophisticated; but it's easy and cheap to make a sort-of-similar copy.
Given that you can get the real thing from £40 [Ford Galaxy TDi] and the VAG one is only £70; I really can't see the attraction of the rubbish ones.
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Hello
I have replaced the MAF with a genuine Bosh (refurb) sensor and the misfire has gone. But if I push the car in second or third gear 3-3500rpm I get a lot of smoke from the exhaust. On one occasion the ECU reduced power to the engine.
Mileage 116000
Any ideas?
Thanks in advance.
Richard
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Could be a dodgy turbo acutator arm? (I think that's the name - it's called an N75 or something like that). Someone will confirm!
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He's tried that, I think - mentions an N75 valve in the original post. Could you convince a dealer to fit a brand new valve so you can test if it solves the problem, perhaps under the agreement that if it works, you'll pay for it?
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Valve? I meant sensor! ;)
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He's tried that, I think - mentions an N75 valve in the original post
Doh!
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Richard
A genuine Bosch refurb?? Where did that come from?
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If the ECU reduced power (presume it went into limp home mode) it will have logged a fault code which needs reading. If it was smoking it could be low boost pressure ...i would check the hose to the turbo actuator isn't collapsed/leaking and the actuator is free to move between it's stops. I presume it's a PD engine with vnt turbo ?
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Hello all thanks for all your replies so far.
It is not a PD engine.
The refurbished Bosh MAF came from GSF (German Swedish French - Car Parts) Portsmouth. It comes with a genuine Bosh refurbished sticker and one years guarantee. When replaced the performance was much better than before. I did notice I bit more smoke from the exhaust under load. When the car was warm I thought I would go through the full rev range. This is when the cars power dropped. I have changed the N75 valve but I could not find a supplier for the valve to the left (N18?).
Does any one know where I can purchase replacement braded rubber pipes? These are the pipes that run between the various valves.
Many thanks
Richard
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I have just run VAG-COM on the car and have found and reset the follow fault code.
Chassis Type: 1M - Seat Leon
Scan: 01,02,03,08,15,17,19,22,35,46,56
-----------------------------------------------------------Address 01: Engine
Controller: 038 906 012 FK
Component: 1,9l R4 EDC 0000SG 3357
Coding: 00002
Shop #: WSC 06441
VSSZZZ1MZ2R084574 SEZ7Z0A1485086
2 Faults Found:
17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-10 - - - Intermittent
17552 - Shareware Version. To Decode all DTCs
P1144 - 35-00 - Please Register/Activate
Readiness: N/A
After resetting the fault code I took the car for a drive. It seems to drive a little better, but I think I may have heard a slight squeak when backing off the accelerator. It does not do this very often.
Any ideas?
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Ricardo
17965 - overboost; common code, first check - every inch of those little vacuum hoses.
17552 - MAF sensor; open circuit.
See what comes back; bit timeshort - more later.
What's your engine code?
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