Advice appreciated please.
S type R 4.2 - 2004, 50,000 miles regular Jag Service
Have engine warning light today. My Gendan Engine Tester said P1647 (see below). I have read the other posts on this fault.
Recently I have been tootling along in town at low revs, multiple journeys.

My question - can I assume it is safe to take it out for a higher rev spin to try to clear the fault?

“Multiple definitions available:
Mfr-spec Linear O2 Sensor Control Chip (Bank 2)
Mfr-spec ECM HO2 Sensor Control Malfunction - Bank 2 Upstream (2/1)”



P1647 Sensor values:
Calculated Load 15,29 %
Coolant Temperature 91, C
Short Term Fuel Trim Bank 1 0, %
Long Term Fuel Trim Bank 1 7,81 %
Short Term Fuel Trim Bank 2 0, %
Long Term Fuel Trim Bank 2 4,69 %
Fuel Pressure 378 kPaG
Intake Manifold Pressure 40 kPa
Engine Speed 839 rpm
Vehicle Speed 0 km/h
Intake Air Temperature 43,00 ºC
Air Flow Rate (MAF) 8,70 g/s
Absolute Throttle Position 6,27 %
Fuel System 1 Status Open Loop
Fuel System 2 Status Open Loop

Misfire monitor Not completed
Fuel System monitor Completed
Components monitor Not completed
Catalyst monitor Not completed
Heated Catalyst monitor Not supported by car
Evaporative System monitor Not completed
Secondary Air System monitor Not supported by car
A/C Refrigerant monitor Not supported by car
Oxygen Sensor monitor Not completed
Oxygen Sensor Heater monitor Completed
EGR System monitor Not completed

 

The Jaguar DTC lookup for P1647 indicates it's not going to go away without some remedial action:



I'll leave your question here in General Tech Help and see if it gets advice from members with the same model. If not, I'll move it to S-Type forum.

Graham

 

I was not sure which Forum
D

 

Should be in S-Type forum.

Forget driving.

You can try testing whether it's the circuit but 99% it'll be the sensor. Access is good, but they tend to be in quite tight.

Whatever you do, do NOT replace with the wrong kind!!

 

I second jagv8...especially replacing with the wrong kind...I did and wow what a mess..it started missing really bad all sorts of weird things...it took me a bit to figure out it was the new o2 sensor because I replaced the coils at the same time....put the old sensor back in and it ran fine , just set the code again

 

When replacing the upstream oxygen sensors, check it's the correct one as they are VIN-specific.

 

Thanks for advice Guys above. Yes, I realise now I should have posted in the S-Type section, but since the P1647 fault code is across many Jags, I thought it better in the General Tech Section.
My car is quite old, nearly 16 years, but low mileage, and I remembered that I had similar fault code a couple of times some years ago which was when I bought the Gendan Engine Tester.
Today, when idling in the garage, even after I "deleted"the fault code, the warning light came back on.
So I took the car out for a 5 mile spin, locally in second gear up to 4000 revs or so (we have speed limits) - on arrival back, I deleted the fault code, and it the warning did not return after several minutes idling.
I seem to remember this is what I did some years ago - which cleared the problem.
Hopefully it won't return, but if it does, I will carefully follow your suggestions re correct parts etc. Thanks again - D

 

You must go through two drive cycles for the monitors to either reset or set another DTC, depending on if the fault has been rectified.

 

if all else fails i have had luck by removing the sensor and using a butane torch to heat the bulb just to a glow...that works for a while...had to do it when i needed a smog check to sell a truck but got a sensor code the day before...passed smog nicely and told the buyer about it and never heard anything again

 

I would appreciate your advice please - I am just about to buy a replacement sensor, and I bellieve I have located the correct one:-

Jag S-Type R 4.2 V8 November 2002 - VIN SAJAA03S221M62587

This suggests Jag original "JAGUAR UP STREAM HEATED OXYGEN SENSOR - C2C25956

This seems to equate to Denso DOX-0429 (taken from JagForum list below)- and verified by looking at parts sites.

Can someone confirm that I am on the right track please, so I avoid what seems a common error in obtaining an incorrect sensor?
..

"Here is the Denso table of Jaguar equivalents from the Denso catalogue:
JAGUAR P/N: DENSO P/N
2R839F472AC: DOX-0428
2R839F472AD: DOX-0428
2R839G444AC: DOX-0429
6R839F472AC: DOX-0426
6R839G444AB: DOX-0427
C2C1238: DOX-1196
C2C12588: DOX-0428
C2C22679: DOX-0427
C2C22681: DOX-0426
C2C25956: DOX-0429"

 

Based on your VIN, that appears to be the correct part number: C2C25956.

 

Thanks for advice, will order my part.
D

 

I have now received the Denso part.

Can someone advise please how long a garage should take to fit the sensor to my 2003 S-Type 4.2 V8 R please?

I understand that the sensor is located on the right side of the car as you look from the front?

- and is accessed from underneath?

D

 

Here is a link to the Workshop Manual; refer to the procedure beginning on page 2054:

https://www.dropbox.com/s/aq3872pbu5...kshop.pdf?dl=0

 

Thanks NBcat - helps massively!

Reason I asked about replacement time for Upstream HO2 Lambda/Oxygen Sensor is that the only local Jag "independent" garage (South of France) says it will take "a day to change over" (perhaps I gave him wrong information)

As I understand it, particularly from the downloaded Workshop Manual, access is easy after removing undertray, and replacement with the correct tool should be relatively rapid - say an hour or so?

Is there a download of Jaguar's own recommended fit times?

 

There are fitment times, but they are from third-party sources. You can always ring Jaguar Cannes and request a quote for labour. Replacing the upstream oxygen sensor on either bank should not be very complicated, perhaps 1.5 hours or so.

The shop may have said a day to replace as they probably want to keep the vehicle for the day.

 

DIY isn't too hard. They can be in rather tight, though, so if not used to such stick with any competent mechanic. (No need to be jag dealer.)

 

Thanks NBcat

Unfortunately what they actually wrote was "But the Exhaust sensors are going to take a day to change over so you will have to leave the car with us for a couple of days"
This left me with a lack of confidence

 

Re - "You can always ring Jaguar Cannes"

I have abandoned Jaguar Cannes, who charged me last year 1807 Euros ($2,109 equivalent) for replacement thermostat and temp sensor - they included a pipe costing $1,424, which they said was not broken (and had been ordered with the other parts, saying "it was required by Jaguar to replace pipe at same time!"

 

They are correct in replacing the water outlet with the thermostat, which also includes the water temperature sensor on a normally aspirated 4.2 litre unit. Since you have the supercharged engine, 1800€ is a bit steep for replacing the thermostat as the water outlet is made of metal on the supercharged engines and doesn't need to be replaced.

Perhaps you should speak with the Service Manager?