Those codes are all pointing at a related issue. A/F ratio falling out of range, heater elements within the O2's out of temp range, EGR sensor or exhaust gas temp falling out of range, etc. There is a few areas to consider...
Was any work recently done to the car that may have triggered this? When was the last time you replaced the O2 sensors? Check the O2 connectors and wiring to make sure one of them hasn't contacted the exhaust or melted. Any exhaust leaks especially before the cats? When was the last time you performed an induction service and cleaned the intake, TBs, IAC, etc? The EGR and IACV love to get carbon buildup over the years and can affect flow, similarly can happen to the vac lines to the factory wastegate control solenoid. You mentioned the car felt like it was still running well, so no idle RPM fumbling, hanging, stumbling, etc? Are you running an aftermarket boost control solenoid or OEM? Sorry for the load of questions, but need a bit more to go off of to help point you in the right direction.
Even though the vehicle has considerable low mileage, it's still 30 years old. If it's kept in a garage it tends to handle the elements better than sitting out in the external environmental conditions and will need more routine maintenance and care regardless if it's being driven or not. (i.e. 60K / 120k maint w/ timing belt)
By
protoj ·
.... dam that stuff makes a mess and potentially screws up your alternator!
Having serviced and cleaned the PAS pump I decided to AN the pump fittings and thought I would post in case anyone wants to do similar.
Parts used on the pump were:
2 x Banjo adapter M16 to -8AN
2 x M16 x 1.5 Banjo Bolt (I could have used the originals)
4 x 3/8BSP/M16 copper washer
Here are a couple of piccies...
Also changed all the connections on my PAS POT to AN -8
Finally I still need to weld a -8 female bung into the PAS feed pipe so that it is completely leak proof :hyper:
Then refit, re-plumb - Job done forever I hope! :)