Hi there,

I'm wondering if anyone can help please. I have a Honda Jazz (UK version of the Fit) 1247 cc 2006 automatic which is intermittently blowing fuse 3 (7.5A) in the inside fuse box (in the passenger compartment). The diagnostics are showing error codes P0135, P0141 and P0443 which relate to the front and back O2 sensors on the catalytic converter and the purge control valve. However, the sensors and PCV don't appear to be on the F3 fuse circuit. It also shows a P1298 code.

The catalytic converter was replaced 2 years ago along with the sensors - they were all stolen. They still all look in new condition and the wiring is not rubbing on any metalwork and appears to be routed correctly through rubber washers into the car. The remainder of the exhaust was recently replaced. The PCV is the original and I have a secondhand spare but I'm reluctant to just to change parts. A local garage said it was the battery and the alternator at fault and replaced both but the fault has not gone.

I can't identify any particular conditions under which the fuse blows. The most recent times were about 30 minutes into a journey and then last week, two minutes after the car had been started and was idling on the driveway. It has been raining sometimes and not at others. When the fuse blows, the car still runs okay but I lose the instrument display and power steering, and the battery won't charge. Everything else works okay.

I can replace the fuse and clear the fault codes. I've tried turning all the electrical items on and off, putting them all on at once, using the headlight movement motors (which are on the F3 circuit - fuse doesn't blow. The engine runs smoothly with no misfires with either the fuse intact or blown.

Does anyone have any suggestions please? It's an extremely low mileage car for its age (66000 miles).

 

I'm leaning towards instrument cluster overdraw/intermittent short, but I would start by checking the grounds on the modules in the attached pic -notice mine states 10A. If yours is correct, look at IC cluster for any odd lighting, erratic display, etc. Anything indicating electrical issue. Wouldn't hurt to take it apart and check for dry solder/other indicators of faulty components.

Another possibility is you got a cheap-o or bad O2 sensor. Check resistance on the heater circuits for each. If out of spec replace. Google the spec (most are generally similar).

Following that you're in a chasing down a probable integrated circuit issue.

Good luck.

 

Thank you for your response. Much appreciated. I'll give those suggestions a try.