Jaguar Repair Problems? Ask a Jaguar Repairs Expert.
Hi my name is***** with me while I pull up your codes and some information to help.
Hi Matthew. My sincere apologies about the delay. I am glad you posted back. Experts are not employees of the site. I help on here in between jobs as time allows and had a few emergency calls I had to go out on and got tied up. If you replaced both O2 sensors and the code still exists then test and inspect the wiring harness between the sensor and PCM for any damage or corrosion in the harness. Test for continuity with an OHM meter. If the harness test good and the sensor is good it points to a problem in the PCM
The 1600 fault actually confirms an internal problem with your PCM. Replace your PCM
P1600 ECM Battery Back-up Circuit Fault
the internal battery that Keeps the memory alive has failed
I have a repair business and work on multiple makes and have been a technician in the industry since 1995 and had two years automotive certificate and a diesel degree prior to that
First test all your power and grounds to the PCM and confirm no open circuits or problems in the harness. Be sure all fuses test good
Sure. The PCM monitors the upstream O2 values before the cat and then compares them downstream form the sensor after the Cat and those values get read by the PCM to make any necessary adjustment with EGR, fuel trim, etc. when you have any vacuum leaks, EGR valve problems, exhaust leaks or restrictions it will throw those expected readings off. If the PCM itself has internal issues or software issues it can also cause multiple faults to occur