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VW Beetle AQY 1999 - Fault code P0135 O2 sensor bank 1 no activity #

Posted by Michael Hill on February 8, 2010, 10:59 pm

Year of Manufacture *: 1999
Engine Code or CC *: AQY
( Optional ) Scanner Used: VAG com

hello all,
I have this vw beete, keep getting the trouble code P0135 o2 sensor bank 1 no activity.

now i gone through live data and found o2 sensors to be operating within range and pretty good, the customer has put 2 genuine sensors on. iv found the car to have a little misfire every now and again. the mil light comes on when driven for about 15mins, water level drops over a period of time. im suspecting head gasket will be doing the test tomorrow. but need to rule out every aspect first.

does the maf contribute to this code?

thanx in advance.

regards
mike

Re: vw beetle - fault code P0135

Posted by Mark Carter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on February 8, 2010, 11:10 pm, in reply to "vw beetle - fault code P0135 "
Mark Carter

So what tests have you done to prove the fault code?
regards mark

Modern cars, Its all wizardry and witchcraft

Re: VW Beetle AQY 1999 - Fault code P0134 O2 sensor bank 1 no activity #

Posted by michael <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1084' width='330' height='300' border=0 style='border:none;'> on February 9, 2010, 11:23 pm, in reply to "VW Beetle AQY 1999 - Fault code P0135 O2 sensor bank 1 no activity #"
Michael Hill

hello,
right to add to my pretty poor post (very tierd and annoyed when wrote that).

Took for a test drive drives fine very responsive no mil light untill about 10 mins in to the drive and i pull over and then the mil light comes on, re scanned and the following fault codes are on again.

P0300 random multiple misfire.
P0304 Misfire cylinder 4
P0134 O2 sensor Bank 1 no activity
P1125 fuel trim system too lean.

Now for my tests.

tested maf with a multimeter.

1.4v idle and 3.9v sharp rev.

Checked for all air leaks all ok.

done a block test all ok fluid didnt change.

compression test 12bar all good.

front o2 sensor not changing form 0.050v very low
(the 3rd brand new genuine sensor fitted)

there does seem to be a very slight misfire on idle but runs lovly.

im at a bit of a loss with this one.

hope theres some one who can help.

regards mike!

Re: VW Beetle AQY 1999 - Fault code P0134 O2 sensor bank 1 no activity #

Posted by Steve Gittins <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1086' width='330' height='300' border=0 style='border:none;'> on February 10, 2010, 8:13 am, in reply to "Re: VW Beetle AQY 1999 - Fault code P0134 O2 sensor bank 1 no activity #"

How did you check for air leaks, I'd still be suspicious of an air leek particularly around No 4 end of the manifold. Checked manifold Vacuum?? Smoke machine??

Also do an emissions test, does what are you getting out of the tail pipe tie up with the o2 sensor stuck low and the rest of the evidence??

May be miles off, Hope its of some help.
Steve.

Re: VW Beetle AQY 1999 - Fault code P0134 O2 sensor bank 1 no activity #

Posted by Mark Carter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on February 10, 2010, 8:47 am, in reply to "Re: VW Beetle AQY 1999 - Fault code P0134 O2 sensor bank 1 no activity #"
Mark Carter

What does the sensor reading do when you promote change?
regards Mark

Modern cars, Its all wizardry and witchcraft

Re: VW Beetle AQY 1999 - Fault code P0134 O2 sensor bank 1 no activity #

Posted by Michael Hill on February 12, 2010, 5:51 pm, in reply to "Re: VW Beetle AQY 1999 - Fault code P0134 O2 sensor bank 1 no activity #"
Message modified by board administrator February 14, 2010, 12:29 pm

hello all, thanx for the replies.

Ok here goes,

i done a emmisions test, sfter a 15min run i done the test and it was really high on all scales (sorry never got a print out) but on the fast idle test it all came down and passed the test then on idle it was still good. cleared the codes and on the way back the light came on again to a new code o2 sensor low signal.

I phoned the customer who then decided to inform me it was a direct fit sensors he put on it NOT genuine ones which he had told me!!! he also informed me that when he had put the new sensor on it was fine for a couple of weeks then went bact to playing up!!! so now i have a gen sensor on order an arriving tomorrow! so will let you know my results.

Oh a to marks question when i first had the car i could promote change with reving it then i could and yesterday i could so im starting to think the sensor could be dodgy!

thanx mike!

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