Wet air filters

E

elugelab

New member
Unfortunately got a check engine light recently and down on power. No limp mode, just not nearly as quick as it should be, and not blipping the throttle on downshifts etc.

Read the codes and have the following, showing something up with one of the MAFs. I'm checking the battery etc to make sure it isn't that, but presuming it isn't that, any ideas on what you'd replace? I'll check the wiring / connectors etc but if I was replacing MAF, which one would it be for circuit B?
 
Link (search for p115d)

https://www.jlridssddmongoose.com/diagnostic-trouble-code-index-dtc-v8-s-c-5.0l-petrol-dtc-engine-control-module-ecm/
 
So to update on this, the car got worse and worse. Ended up trailering it to Tom Lenthall, and they got back ot say that the air filters had got wet at some point and broken up, and were being sucked up the air intake, getting caught in the throttle body.

Sounds like no lasting damage identified but v interesting. I haven't driven through any floods so slightly nervous about how it happened!

Interested to hear if anyone else has ever had the same. Might get borescope into the cylinders in to check nothing bad has happened.
 
You can look the code up on that TOPDON 400 i.e. the P115 & PUOBE code, but I guess you knew that. I would have gone straight for the air filters.

I'm not surprised really that it is the air filters, they are a pain to change and you do have to buy the two and they are in no way symmetrical so you have to have the LHD & RHD ones. The hardest thing to change is always the least done!

Can't think off the top of my head why water would be in there, the 'B' side is that the passenger side? If so that would be the side probably going through more wet puddles on side of the road than the driver's side. But then again maybe the filter box had not been closed properly allowing water in. I take it was only the B filter that was breaking down.?
 
Clymout said:
You can look the code up on that TOPDON 400 i.e. the P115 & PUOBE code, but I guess you knew that. I would have gone straight for the air filters.

I'm not surprised really that it is the air filters, they are a pain to change and you do have to buy the two and they are in no way symmetrical so you have to have the LHD & RHD ones. The hardest thing to change is always the least done!

Can't think off the top of my head why water would be in there, the 'B' side is that the passenger side? If so that would be the side probably going through more wet puddles on side of the road than the driver's side. But then again maybe the filter box had not been closed properly allowing water in. I take it was only the B filter that was breaking down.?
Click to expand...

Thanks - not confirmed which one was breaking up but will find out. I just can't believe that the airboxes would allow puddle splash in by design, but stranger things have happened. Unless perhaps it was driven through deep water before my ownership and theyve only recently got to a point of breaking down from deterioration.

Will update once the final verdict is in.
 
Please do, it's the first occurrence of this I have heard. I recently had mine changed at a major service with no reported issues. The garage would have told me, as they do, if anything untoward was found.
 
This happened to my friends f-type too. Check engine light, loss of power and wet air filters sucked up into the engine. I'm not sure if it could be jet washing? Since I heard about his filters I have been careful jet washing the intake grills on mine!
 
To update, Tom Lenthall have confirmed no other issues beyond the air filters. Intakes cleaned etc and the car is reportedly back to normal. Picking up next week.

I asked if they'd seen this before and they confirmed it was unusual, but not the first. Further, they thought that generally driving it a lot in wet weather couldn't help - not just going through deep water.

I've never washed the car since I bought it (!) so it isn't washing that has done it. I wonder if they were original filters and had just had one too many puddles since the car was built in 2016.

Now of course I'll be paranoid every time I drive it in the wet.
 
Car is back and running perfectly. Good service as always from Tom Lenthall and team.

I suspect I'm going to be nervous about driving it in the heavier rain these days but will perhaps have the filters changed more regularly from hereon.

If anyone gets some weird losses of power and MAF fault codes, it'll be your air filters.... stop driving and get them replaced.
 
Jaguar’s service plan identifies air filter change every four years. If they hadn’t been changed from originals I guess they could degrade over time or maybe a low quality replacement was fitted? I wouldn’t have thought driving through heavy rain, jet washing (unless jetting the front underside) or the odd puddle would cause it as the continued airflow would dry them out. Unless of course it was frequently going through some deeper puddle water just before turning the engine off 😖 think you’ll be fine 👍
 
Thanks - really not sure on the cause ultimately. The car has been well maintained in accordance with service schedule so should have had new filters in 2020ish. Always Jag main dealer serviced until I bought it in Nov 2022, when it started to go to Tom Lenthall.

Suspect I'm just unlucky here, but all appears to be well that has ended well.
 
The air intakes are behind the front grill, pointing upwards, I supposed if you aimed a hose pipe or prossure washer into the front grill at the correct angle you could potentially fill the airboxes with water, accoring the service manual there is a drain valve on the bottom on the air boxes, in red on the diagram.

Each air cleaner incorporates a drain valve to prevent the
accumulation of water within the air cleaner housing.
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Having gone through a few cars and online service history and servicing information there is no mention to "air filters" anywhere in the first 10 years as a service item.

Engine filter, oil filter and pollen filters yes.

There is an item described as "Replace the air cleaner element" every four years. Can anyone confirm if they have had both air filters changed during a service??
 
simpleR said:
There is an item described as "Replace the air cleaner element" every four years. Can anyone confirm if they have had both air filters changed during a service??
Click to expand...

I've had mine changed several times. However, according to the OSH, they hadn't been changed when I bought the car - at 4 years old (the car, not me 😂)
 
:lol: :lol: :lol: :lol: :lol:

4 years for changing air filters is too long.! Saying that Ive never changed the filter on my Impreza having owned it for 10 years, although it is the type you clean :D
 
My air cleaner elements were changed at 4 years at the dealer service, but then left until 5 years on the advice of Adam at Tom Lenthall.

4 years is up to 64k miles so, unusual water issues notwithstanding, the filters will still be working efficiently for most people’s annual mileage - mine came out looking pretty clean still.

On a similar note the pollen filter is easy to pull out compared to most cars and really benefits from a gentle opening of the rows to get the dead flies and bits of debris out every few months, especially in summer.
 
If it had been one filter that was sodden I’d have suspected a stuck or debris jammed drain valve - like the leaking one-way washer valves you sometimes hear of - and water splashing into the air box from below.

I guess it’s unlikely to happen on both sides though, and first time I’ve heard of this issue - other on cars from Inchcape Derby maybe 🤔🙄
 
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