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Oxygen (Lambda) Sensor Heating: B1 S1: Open Circuit

That is likely to be a fault with the wiring where it meets the lambda sensor multiplug. I had this fault and on changing the lambda, found the broken wires. It's worth looking at before you buy a sensor that you don't need.

cheers stan really appreciate it. will have a good look tomorrow. where abouts should i be checking? how did you end up fixing yours?

16688 - Cylinder 4: Misfire Detected
17927/P1519/005401 - Camshaft Adjustment Bank 1: Malfunction
16845 - Fuel Level Sensor Circuit: Implausible Signal

00287 - ABS Wheel Speed Sensor Rear Right (G44)
01276 - ABS Hydraulic Pump (V64): Signal Outside Specifications

Camshaft sender is an easy replacement - its just one hex bolt and it pops out. If you take the plastic engine cover off the top of the engine, youll see it located to the right

Its about £40 from the dealers - only use a genuine part

Like stan says, the lambda fault is likely to be broken wiring. Where the exhaust manifold is on the front of the engine, to the right on the gearbox side you will see where the lambda screws into the manifold. The wiring where the two plugs connect which are attached to the bracket is where you need to check - note that its the engine side of the loom as opposed to the sensor side which commonly fails.

As for the rest of your problems, the ABS outside specifications is either the typical broken solder joints inside the control module, or a blown fuse for the ABS pump (yellow on top of the battery)

The ABS speed sensor failures being front and back on opposite sides implies you may have fault senders. The fronts sometimes end up with damaged wiring if people dont clip them back in after removing the suspension etc. The rears its often just the plug under the rear seats that needs unplugging and replugging

The fuel level sensor failure is probably nothing to worry about - sometimes this happens if the fuel runs really low

The cylinder 4 misfire is either a fault spark plug, or a worn HT lead. If you havent replaced the sparks and HT leads yet, its worth doing. It often makes a big difference.

stefanhenchoz wrote:cheers stan really appreciate it. will have a good look tomorrow. where abouts should i be checking? how did you end up fixing yours?

I chased the wiring back into the harness from the multiplug and cut it out. Then I repaired the wiring to the plug on a bench with some other car wiring I had from another project and then soldered it back into the car. 4 out of the 6 wires had broke on mine right next to the plug too!

mr perkins you are a star.

i had a sleepless night worrying about the fuel level sensor. having nightmares about removing fuel pumps and fuel tanks haha fuel level is remaining consistent on the little driving i have done in the car.

its in need of a good service as well so hopefully that sorts the cylinder 4 issues. will get the sensor ordered for camshaft and double check abs this weekend.

many thanks for your input guys.

No worries

If you are over 60k miles, replace the sparks and HT leads anyway....makes a good difference HT Leads are realistically good for 50-60k anyway

right a bit of progress has been made. changed out the plugs and leads for new ones after work. have also swapped out the abs module for a replacement. seems someone must have got the shakes when topping up the coolant once and poored it all over the control unit, it was pretty corroded around the screw holes and the pump itself.

vag com'd faults and cleared however im still getting both abs sensors being faulty (tried unplugging sensor cable under rear seat) admittedly i havent been for a drive yet but im still getting the 3 beep handbrake light and abs light - is this correct? i was anticipating just having the abs light on without those damn beeps sounding

camshaft sensor also on order so will fit this week.

booked in with my local indy next friday for clutch cable inspection/replacement (its a little stiff), oil service, cambelt inspection and gearbox oil change. am also going to get abs sensors replaced if a drive doesnt sort the above issue.

finally checked over the lambda cabling from multiplug backwards and all the wires under the hosing looked fine and intact. so it looks like a replacement lambda on the cards. any recommendations? as soon as the abs fault is fixed i think i might actually be able to start enjoying this car

more progress

have replaced both abs sensors and front pads yesterday, cleared fault codes in vagcom and now hooray the abs and handbrake light no longer lights.

still waiting for camshaft sensor to turn up. then friday its going to get a service and replacement lambda sensor.

stiff clutch i feel could well be the clutch itself rather than the cable as i get a slight judder from setting off. when i had this on my octavia vrs a replacement clutch fixed it a treat.

now to refurb the wheels as per the how to guide on here (thanks OP) and then a touch up on the bodywork. will get some pics posted soon. thanks for your input so far chaps

Glad you are making progress

When you get the lambda sensor, ensure you use either a genuine VW part or a bosch equivalent - theres a lot of crap copies around!!

Clutch is likely to be the release bearing. To get to it though, the whole lot has to come off, so it makes sense to change the clutch at the same time

If you use an LUK, SACHS or Valeo kit, or in fact any other make, ensure the release bearing is pressed metal - if it isnt (and often not as they are cheaper and plastic cased on the inside housing) pick up a genuine one from your local VW dealer - its about £39 quid but well worth it. LUK clutches at the moment can be picked up for £75 from Euro Car Parts with trade discount which is very cheap!

Also ensure you get one of these from VW - 085 141 181



These commonly fail, and go oval - its what the release bearing slides onto. They are only a couple of quid, but its worth replacing if you do a clutch change.

Im doing my clutch next week

thank alex i will keep those points noted for when the time comes to replace. certainly needs doing in the next few weeks.

also still getting the cylinder 4 misfire fault. which makes me think its ignition coil thats to blame? easy swap out? could this misfire being throwing up the lambda sensor fault i have experienced?

New coil is quite easy to sort. It's called a DIS module on the polo as it works differently

Lambda wouldn't cause a misfire as such

sorry should have worded that differently.

will the misfiring 4th cylinder also activate the lambda fault light seeing as fueling etc is now all messed up? or am i just clutching at straws trying to find a way out of paying £100 for this lambda!

just noticed you're located in poole alex. regularly pass through poole on my way back home on the ferry to Guernsey

Unlikely. Just two coincidental faults

Oh haha. Not far then!

no just shy of 100 miles haha

out of interest which clutch you opting for?