Check Engine Lite comes on at ever start. Once cleared, it stays off until the next start. Any ideas as to why?

Chuck

 

Could be anything? Does the car drive okay? People have said if the fuel cap isn't tightly closed, this could cause a CEL.

Really need the DTCs, from the OBD2 port, to see what is causing the CEL. If you've cleared the CEL, have you recorded if there's any DTCs?

 

How long for? It's supposed to illuminate at each start just to show that the bulb works.

 

919

Correct, but---
After start, and when engine is idling down to normal, 600RPM, the lite will come on again. Once cleared will not come on again until next start.

Chuck

 

Chuck,

I’m confused here. What do you mean by “... once cleared.” Are you saying you have an intermittent CEL on the dash board? It comes on and off.

Or are you saying you’ve plugged in an OBD2 reader and cleared the codes and CEL?

Whatever your problem is, we need the DTCs. If you don’t have a reader, any garage can do it for minimal charge. Report back here with the codes

 

If you're doing an OBD code clear - STOP.

Instead, read the code(s) and fix its/their cause(s). If you want help, post the code(s).

 

Jag V8
I do that the next time I start the car----------Thanks


Chuck

 

Hi Chuck,

Most of the chain auto parts stores in the U.S. will scan your car for Powertrain-related diagnostic trouble codes for free (Autozone, Advance Auto, O'Reilly Auto, Pep Boys, etc.). The Powertrain DTCs (P-prefix) are the ones most often associated with Check Engine Light illumination.

A lot of P- DTCs are related to emissions systems and may not represent urgent issues. But other codes represent serious malfunctions such as misfires that can damage the engine, ruin a catalytic converter, etc., so you really want to have the codes scanned as soon as possible.

Post them here exactly as they appear and you'll receive lots of help.

Cheers,

Don

 

Don B ; Thanks--
I have an OBD2 reader and I'll post the readings as soon as I can.

Chuck

 

Don B,
I started the convertible this afternoon and the ODB reader only gave two readings. One was P1000-Engine Readiness test and the second was P1647, HO2 Sensor Control, Bank2 Upstream Bank 2.

Chuck

 

Chuck,

Thanks for following up. The P1647 DTC is a sensor failure on the exhaust catalytic converter. Getting to it means getting under the car and DTC upstream means it’s the top one.

Worth checking the wiring first for shorts and/or broken wiring before purchasing new sensor. Lots on the market readily available. Beware the cheap versions on the market as the Part needed on the Jag has a built in pre-heating element.

 

Related thread for your perusal:
https://www.jaguarforums.com/forum/x...000-xkr-56837/

 

Hi Chuck,

The Jaguar definition of P1647 is failure of the Bank 2 Sensor 1 (upstream) heater or a problem with the sensing circuit, which can be caused by corrosion or looseness of the electrical connector, damaged wiring, etc. Very rarely the code is caused by ECM failure, but you would probably have other DTCs stored if that were the case.

The odds are good that your B2/S1 O2S has failed, but before you commit to replacement, it would be worth cleaning its electrical connector and inspecting its wiring harness for damage. If your scan tool can view Live Data, you can also run the engine up to full operating temp, then compare the Bank 2 Sensor 1 signal to the Bank 1 Sensor 1 signal to see if signals are similar. You can also view the Short Term- and Long Term Fuel Trims (STFT, LTFT) for each bank to see if they differ significantly. If you note any damage to the wiring of the sensor, or if cleaning the sensor electrical connector doesn't improve or restore the O2S signal, then it's safe to conclude you need a new O2S. On your 4.2L engine the sensor OEM is Denso. Check with our forum sponsors and Rock Auto.



The P1000 DTC simply indicates that not all of the readiness monitors have reset. In your case, the O2S readiness monitor cannot reset due to the P1647 trouble code. Once you resolve the P1647, the P1000 will eventually turn to P1111 when all of the readiness monitors have reset.

Cheers,

Don

 

Your upstream (sensor 1) is wide band and wont switch high and low like the downstream (sensor 2) narrowband
It should be around 1.00 and stay there + or -
Eg...1.03 / 0.98 /1.01 / 0.99 / 1.00 etc

 

I was doing some work on my driver's seat. I unplugged the battery ground while working. When I re-plugged the battery, I now have a CEL with a code P0011, "Camshaft position over advanced" I took the car for a drive to see if the light was temporary(not). I did not notice any bad driving characteristics, but only went about 30 mph.. Is this an intermittent CEL?