keithstype27

UPDATE 24th Jan 2019. I have now removed, cleaned and replaced both MAF sensors but the fault code P0404 remains. I can clear the fault code but it comes back immediately, including the Restricted Performance light and message resulting in a lack of power when accelerating. So far I have *Had the car serviced, (oil, filter, air filter, pollen filter & fuel filter) *replaced the battery *Used Wynn's EGR cleaner (3 x cans) into the air intake *Cleaned the MAP sensor *Cleaned both MAF sensors Having now 'exhausted' all of my own efforts to trace the P0404 fault to some other cause other than a faulty EGR valve, I am now referring the problem to Carl for replacement EGR valves and have left him a message.

Hi Peter, that's excellent news. I'll ring him. Kind regards Keith

Hi Peter, Ha ha! If only I could put my 'tool kit' away for good but finances dictate that I keep going. I am very grateful for your continued advice and assistance with this issue. I have also had 'gearbox fault' come up on several occasions, especially when the car is driven from cold. As I have gone alone, using the Wynn's EGR cleaner spray and also the Millers Diesel Power EcoMax additive, also cleaning the MAP sensor (which was very 'gunged' up) the car has become smoother and smoother and the gearbox fault hasn't recurred. I did not know that P0404 refers to the left side EGR (drivers side) as this is not shown in the icarsoft i930 information. This is what was leading me to believe the fault may actually be elsewhere, ie the MAF or MAP sensors or perhaps the EGR sensor itself. I don't suppose either of us for one minute imagined that you would need to have your car 'sorted out' before mine and I feel somewhat guilty that I could benefit from your misfortune as you are in effect guiding my path to clarifying the fault with my own car. I intend to keep my S Type 2.7 as it is by far the best car I have ever owned. I shall therefore be rectifying the issue, whatever it may be. Good luck for the diagnosis and thanks again Regards Keith

Thank you Peter. I have previously tried 'tapping' both EGR valves with a small hammer and tube, just in case either was 'stuck' but there was no change afterwards. I find thing so confusing when the datastream on my icarsoft i930 shows EGR 0 and EGR 1. I have no idea which is Left or Right and which side of the car that is supposed to be. It would be great if someone with a fully functioning 2.7 S Type posted their datastream readings so they could be compared to a faulty EGR reading. I ran a test yesterday and recorded the EGR datastreams. My results were as follows. Difference between EGR set point and actual = fluctuates between -0.06% and 0.18% EGR set point is fixed at 7.25% EGR controller Deviation for EGR 0 = -5% EGR controller Deviation for EGR 1 = fluctuates between -4.86% to -5.00% I also noted the MAF reading MAF sensor A frequency = 7g/s MAF sensor B frequency = 11g/s I don't expect you to reply to these reading Peter, I'm just posting them in case they may assist someone else. Kind regards Keith.

Hi Peter, Many thanks for that info. Is the 'LEFT' side as you look at the car from the front (ie drivers side) or from inside the car (ie passengers side?) Regards Keith

Hi Peter, Many thanks for the continued support. I will be very interested to hear the result of Carl's assessment. I have not found any information online to state that P0404 means that one of the EGR valves is not working at all but if correct, this could be the end of my 'searching' to establish the cause of my P0404 RP problem. There seem to be numerous forum stories of EGR related codes but alas, no follow up entries to confirm the cause. Many thanks again Regards Keith

UPDATE 20th Jan 2019 Having removed and cleaned the MAP sensor ( a very easy procedure) the fault code P0404 remains, although the car seems to run a little smoother yet again. All of my attempts to remedy the Restricted Performance fault code P0404 have so far failed but all have improved the running of the car. I have also used a can of Wynn's Extreme EGR cleaner (sprayed directly into the air intake with the air filter removed first) but the P0404 code remains, I can clear the code with the Icarsoft i930 but it returns immediately. Next procedure will be to replace both MAF sensors.

Hi Peter, Thank you very much for this information. I hope it all goes well. I may well need to call on Carl myself soon. Regards Keith

Hi Peter, I am very sorry to hear that you too have similar problems with your 2.7 S Type. I'm grateful for you sharing this info with me. I expect Carl will verify these faults before he replaces the EGR valves on your car, just in case it is the MAF faults affecting the EGR sensors.(I am an optimist aren't I ?) I shall be away on holiday from Thursday so will not be updating until I get back and have had a chance to swap out the MAF sensors on my car. I'm rather hoping my fault is just MAF sensors...if not I'm likely to be in the same boat as yourself. Oh well, at least we know our cars are worth it. Thanks you again and I hope all goes well with your car. Regards Keith

An update re my continuing efforts to discover the cause of fault code P0404 and the lack of power. I have not yet spoken to a specialist as I have been busy reading through numerous forum posts on these symptoms and similar symptoms and am keen to see if I can find the cause of the problem without spending too much money - something I assume we all prefer to do. To recap. My S Type 2.7 2007 model continually shows the RP light on and the car has no power, as if the turbos just won't kick in (I do not for one moment suspect the turbos to be at fault - it just feels like that) Fault Code P0404 (EGR Control - Circuit Range / Performance) was present. The 2.7 has two EGR valves, one on either side of the engine. Apart from the the obvious EGR valve potentially being at fault (either of both of them as P0404 does not refer to a specific EGR) I have noticed on a few forum posts that owners have had similar symptoms when they have had a faulty MAF sensor. The 2.7 has 2 x MAF sensors, an upper (A) and a lower (B) housed in a split tube layout running directly from the air filter housing box behind the coolant radiator. To test the MAF sensors I have used my icarsoft i930 code reader and accessed the live data stream information relating to airflow through both MAF sensors but it does not show the individual sensor readings. This is overcome by dividing the total reading by two for an approximate 50/50 reading. With the engine at idle, my reading for the total of both MAF sensors is 24.50 g/s (+ or - a bit as it fluctuates). I read on another forum post that each MAF should be showing around 6 g/s so the total should read around 12 g/s.!!!!! To test each MAF individually, I simply disconnected the top MAF (bank A) wiring and the data stream reading showed 11.03 g/s using just Bank B On replacing the top ( bank A) wiring and removing the bottom MAF (bank B) wiring I had a reading of 9.16 g/s from Bank A I tried driving the car with the separate MAF's disconnected and then with both MAF's disconnected and the RP light stayed on throughout and the lack of power was still present HOWEVER, the P0404 EGR code was NOT present and did not recur at any time. Hoorayyy!!! (The MAF codes P0100 (Bank A) and P010A (Bank B) were present when the two MAF's were disconnected. I assume these codes will also cause the RP light to come on because the P0404 EGR code did not show up) but the RP light was on throughout and the lack of power remains. From these tests I assume that the EGR fault code P0404 is being caused by the MAF readings being excessive, either separately or jointly, sending an incorrect signal to the EGR valve that then tries to adjust itself to compensate. I have now ordered two replacement (used) MAF sensors to test my theory and will update again once these have been fitted. Please chip in if my assumptions are wrong and feel free to correct any stage as my intention is to share as much as possible. Many forum posts give the symptoms of a problem and subsequently show various opinions as to how to correct the problem but then fail to show the results, so we can't learn from them.

Hi Peter, Thank you so much for your reply. I would be most grateful for his contact details please 🙂 Regards Keith

Hi Peter, Thanks for your reply. I have heard numerous good reports re Terraclean, however I think it very misleading on some I've seen to suggest that the process can clean an EGR valve. My understanding now is that their 'solution' burns within the compression cycle so none would be left to do anything to the EGR valve on it's way out. My email to them was a hopeful one, perhaps expecting some encouraging remarks re their special egr cleaning technique I've seen advertised but as you can see, there was no mention of it in their reply. I have been using Millers Diesel Power EcoMax additive for a hundred or so miles and it does seem to be a little smoother, however it has made no difference to the P0404 code that keeps returning as soon as the engine gets warm and the lack of power (restricted performance) remains. Oh well, I suppose I now need to take my S Type 2.7 to an independent Jaguar specialist for their assessment and probably then a replacement pair of EGR valves. I'll update on any progress come the new year.

Having considered trying the Terraclean option to see if it would clean my EGR valve(s) I've just had the following response from a nearby Terraclean authorised company. I believe this suggests that their process will not effectively clean an EGR valve. I have no idea how effective it may be on other parts of the engine and fuel intake section but with this response I won't be taking up the option. "Thank you for your enquiry regarding Terraclean We can offer this service for both petrol and diesel vehicles prices are below : Up to 2l petrol :£111 Over 2l petrol £129 Up to 2l diesel £117 Over 2l diesel but up to 4l £135 over 4l ring for price all prices include vat To book an appointment or for more information please call us and we will be happy to assist you further If you have fault codes relating to a possible egr fault you would be better getting is diagnosed first as a Terraclean may not help if the EGR is faulty and that may need replacing/ taking off and cleaning before a Terraclean would be of benefit"

If anyone should be following this or have similar problems in the future, I will catalogue my efforts to rectify this problem as I go along, choosing the cheapest options first. 1. Have used 2 full cans of EGR valve cleaner sprayed into the air intake. Initially the car responded in the way it said on the can, ie, the rpm increased with each short spray, however toward the end of the second tin the engine rpm stopped increasing. The info' on the tin states that if the engine rpm does NOT increase when spraying the mixture into the air intake, stop the procedure and consult your workshop!! (I have emailed Wynn's asking what this may mean) 2. Millers Diesel Power Ecomax added to fuel, 2 x 50ml 3. Car has been serviced, engine oil and filter (in case oil has been diluted), fuel filter and air filter (pollen filter too). so far, the car feels smoother but still lacks power and despite clearing the P0404 fault code with the Jaguar specific Icarsoft i930, the code returns as son as the engine gets warm. Having read numerous online reports of EGR problems, my car seems to lack the black smoke and rough idling symptoms.

Thank you David. Unfortunately the S Type 2.7 has two EGR valves, one either side of the engine and they are very different to the X Type. Regards Keith

Hi Peter, Many thanks for replying. I saw one of your previous replies to another member on here advising the use of Millers Eco Plus so I have some ready to use as soon as I fill up with fuel. Thanks again Keith

Hi, I have been lucky enough to own my 2.7 S Type for 9 years without any major difficulties. In the last few weeks I have occasionally had the Restricted Performance light (amber) come on and the car then lacks acceleration and generally has a lack of overall power. If I switched the engine off and waited a few second before restarting, the problem didn't repeat. However, a few days ago this Restricted Performance came on and now refuses to go away. It always comes on once the engine is up to running temperature. I purchased the icarsoft i930 code reader and code P0404 is the result. This code is EGR valve related. I have since tried two tins of Wynn's EGR cleaner into the air intake and toward the end of this process, the cars rpm failed to increase during the treatment. The information on the tin says if this happens, stop the treatment and contact you workshop. I have checked my records regarding the service of my Jag and find that although the car has done 11000 (eleven thousand) miles since the last oil and filter change, the period has been almost two years. I generally don't use the car for short journeys but I'm wondering if the EGR problem could be related? Have any other members had similar problems and if so, what was the cause please?

Hi Peter, Thank you very much for your replies and for the contact details for Carl. I'll 'phone him and will tell him that you recommended him Many thanks again Regards Keith

Hi Peter, Thank you for the speedy response. Coincidentally I have spoken with the main dealer in Coventry who are doing a deal - £350 for cam belt and tensioner, inclusive of VAT. I asked about the water pump and was told that they very rarely need changing but if I did want it changed the price went up considerably at £500+. There are also issues with getting the car to them etc. I like the idea of a mobile mechanic (I have a drive where he could do the work) as it saves trying to sort out delivering and collecting the car. I'm not sure if he would take on the cam belt replacement but it's worth me enquiring. Are you able to message me his contact details please? Kind regards Keith

My 2.7d S-Type now needs a cam belt change due to mileage (105,000) so I'm looking for the best deal in the West Midlands. Can anybody recommend a suitable place to take it please? Also, should I get the water pump and auxiliary belts done at the same time?

Hi Robert, It is now some years since I had my alarm sounder problem and it has never happened again. I am convinced that it was caused by a low battery - not the alarm sounder battery but the car battery. You see, I only use my S Type occasionally and it could sit for weeks on end. Just a thought but it may pay you to check the car battery before embarking on other possible remedies. Fingers crossed for you. Keith

Hi Charles34, thank you for responding to my post. I purchased a DELPHI alarm sounder unit (exactly as you described) and was waiting for an opportune time to tackle the job of replacing the unit. My undestanding is that the unit starts to beep when the backup battery inside the DELPHI is running low. I've read that they last approximately 6 years.(My S Type is just over 4 years old) Thanks also for the links. I have seen those but like you, I'm not sure my car is the same. I did see one forum where a guy described taking the DELPHI unit apart and replacing the internal batteries (3 or 4 small round watch type). However, my problem has now stopped. I did nothing to the car, apart from leaving it unlocked whenever I was at home and could keep an eye on it. The problem continued for several weeks, mainly beeping during the night, which was very annoying. I still have my DELPHI unit incase the problem starts again but for the last 3 weeks it has been fine with no beeping at all. I cannot explain why it started beeping or why it has now stopped. I have a feeling it will happen again so I am still keen to find a fellow S Type owner/technician who can explain how to change the DELPHI unit. I have heard that they are connected to the car with tamper-proof bolts. (Just to make it a bit more difficult to change as a DIY job) Thanks again keithstype27

I have a 2007 S Type 2.7 SE Auto. A few weeks ago I was awakened by a beeping noise outside and eventually realised it was my S Type, although no lights were flashing, neither was the horn sounding. The beeping comes from the drivers side front wing. It can be stopped by unlocking the car with the remote keyfob but once relocked it sounds again within 30 mins. If left beeping, it stops for a short period then begins again. It can be fine for a few weeks, then it starts again. I am informed that this could be the alarm sounder backup. I have now purchased a new replacement sounder unit and am hoping to tackle the job myself. Has anyone here changed an alarm sounder unit on their S Type and if so, would they be kind enough to share the procedure? Thanks in advance