When is an air temp sensor not an air temp sensor?

[krisby]

Had a P0113 error in the wifes Toledo, turns out its the Intake Air Temperature sensor. So bought a replacement and looked around for when it is. Found plenty of references to it, but it was submerged in coolant in a pipe, so figured these muppets are talking about the wrong thing.

Uh 'uh, couldn't find it where you might expect, between airbox and throttle body, looked where others had suggested, popped out and sure enough, an IAT appears to be the wrong description for it. It is would appear to be some sort of coolant sensor, cos its certainly not take taking its readings from the intake or from air.

So, anyway, cleared error, and it came back, but not yellow, now red, positive deviation. So I'm stuck and given its got a misleading name anyway, I'm not sure where to go next.

 

[Muttley]

What engine?

The intake air temperature sensor is frequently packaged along with the intake pressure sensor. On SMIC TDI's the combined sensor is on the intercooler collector. The 1.6 engines have a temperature sensor combined with the MAF. The non-supercharged 1.8 engines have a combined temp and pressure sensor on the intake manifold

The 20VT petrol engines have a separate temperature sensor on the intake manifold.

If a temperature sensor is in contact with the coolant, it's the coolant temperature sensor.

 

[krisby]

Sorry, its a 1.8 20V

That was my thought too, its a coolant temp sensor, but car parts for less and euro and some other site all showed this as being a intake air temperature sensor, even a how to I found calling it the same, said it was in a coolant pipe, yet none of the replies questioned why it was called an air temp sensor if its not detecting air temperature.

I guess then, can anyone definitively tell me where an air intake temperature sensor is on a 1.8 20v (Mk2 Toledo) and I will try and find another part with the same name that is presumably, near the intake manifold. I couldn't see anything when I did look, but then I was looking for something that matched the shape and size of the part I had.

 

[m0rk]

Have you got a photo of what you've bought?

 

[krisby]

http://www.carparts4less.co.uk/cp4l...92ee396377d8aa402f56287b7f170789a949e4&000572


same at euro car parts


http://www.eurocarparts.com/ecp/c/S...92ee396377d8aa402f56287b7f170789a949e4&000572

but this fits in a coolant pipe.

Just found onlineautomotive have the same part down as a water temperature sensor, which is correct, so I'll get my money back from car parts 4 less, but I still can't find an intake air temperature sensor.

 

[krisby]

Have you got a photo of what you've bought?

look at carparts4less link above, shows the exact part, and it plugs into a coolant pipe between the air box and engine.

 

[m0rk]

It's a coolant sensor you have, not an ait

 

[krisby]

Yes I know, thats what I've said, those websites are calling the coolant sensor an AIT when its not, I've emailed C4Less and asked for a refund on the part and just found an ebay seller with the part, couldn't find any actual online etailers that do the IAT.

Now I just need to find where it goes.

 

[m0rk]

Does the 20v have a MAF?

Either way, it will 99% be between the air filter and the throttle, so not too much to check

 

[krisby]

Does the 20v have a MAF?

Either way, it will 99% be between the air filter and the throttle, so not too much to check

Yeah has a MAF, but not an integrated IAT.

I figured it will be there, but when I was looking yesterday I was looking for a small stubby round sensor, whereas the actual IAT appears to be long and thin, so once it arrives I'll have a poke around, can only be in about 18 inches of pipe.

 

[Muttley]

Engine codes AGN, APG, APT all have the intake air temperature sensor combined with the MAF. You can't separate the two.

 

[krisby]

Engine codes AGN, APG, APT all have the intake air temperature sensor combined with the MAF. You can't separate the two.

That was what I thought too, I did try 2 other MAFs earlier in the year but the error remained, I was questioning it last night but when I found a chap on Ebay selling AIT for AGN then that threw that theory out.

So I've ordered the part last night and I'll go hunting along the 18 inches of pipe from the airbox to the throttle body.

 

[m0rk]

Shouldn't be hard to find if it has one... two wires in!

Would seem odd to have a MAF & AIT, but who knows

 

[krisby]

confused.com
Could not find where it goes anywhere, nothing resembled it, nothing in the general area had 2 wires, so I am guessing you are right and it is integrated in the MAF. So I plugged in my spare MAF and the same error remains, odd I would have two MAFS with failed IATs.

Anyway, will get my local garage to order one tomorrow, they can get it far cheaper than I can off carparts4less, even with their 20%.

Hopefully that will fix it, finally.

Anyone recommend the pierburg or just stick with the cheaper Bosch?

I'll be contacting the dude on ebay too, I'll ask him where he reckons it plugs in, cos he lists it as being compatible with quite a number of VAG engines, including V5s, and I would assume if the 1.8 is integrated so would the v5.

 

[Muttley]

1.8 turbo's have a separate intake air temp sensor attached to the inlet manifold.

The V5 170 has the sensor integrated with the MAF, but the 150 has a separate sensor in the inlet manifold.

Judging by reports on the forum, cheap MAF's are bad news, not very reliable.

 

[krisby]

The wifes is the 1.8 20V non turbo, not a cheap MAF, either, Bosch original from eurocarparts, 11 months old.

Might get a pierburg then.

I'm just hoping the IAT is integrated.

 

[krisby]

Got the pierburg today, but its the sensor only, so the old bosch sensor has to be removed from the G30 housing, but I don't have any torx security connections, so ordered some and expressed so will be with me tomorrow, will chuck in flash looking sensor and pray that fixes the issue.

 

[Muttley]

Secure Torx bits are easy to come by from Maplin or Halfords. Makes you wonder just how secure they are.

 

[krisby]

already got them, had express delivery from Amazon, arrived at 9am today, and still cheaper delivered than getting from Halfords too.

Can't wait to sort it, the Mrs car only doing 23mpg, thats less than V5s, so very disappointing.

 

[krisby]

blimmin' MAF takes 5 pointed torx heads, the kit I ordered only came with sixes, so I'm gonna take a walk at lunch time and hope that Marble Arch Autospares to the 5s.