Hi, have you tried cleaning inlet manifold made great difference when mine was done idle settle right down nice and smooth?.

 

What engine are we talking about here ?

 

Zafira_Engine__Z 18 XE

 

Both o2 sensors seem out of wack plus throttle says invalid at anything past partial.

Load seems to be at 30 constantly.

 

That would cause the problems your having , my sons 1.4 Nissan note suffered from the same surging hunting as your experiencing , replaced an O2 sensor & the engine ran properly again .
One thing we did was to disconnect the sensor , this stopped the engine hunting & surging & a quick drive around the block showed the engine running as should. So we changed out that sensor & replaced with a NGK O2 sensor & all cured .

 

Could be an injector problem.....i would check air filter and put some gunge in the tank...Fred.

 

Filter has been checked.

 

Plenty fuel at the rail ?
When was fuel filter last changed ?

 

Fitted new front o2 sensor still no change. going to take throttle body off tomorrow and clean. If that does not work new fuel filter. Only codes coming up now are o2 sensor lean, o2 sensor heating circuit open and exhaust lean.

Noticed an air leak in fuel ventilation hose today but fixed that no change also checked voltage in o2 sensor harness and Maf harness reading 12.7 volts.

 

Sometimes it's best to disconnect the negative for an hour or so on the battery after you have fitted a new 02 sensor to completely clear the fault from the ecu

 

Just changed fuel filter, cleaned out throttle body 1mm hole was blocked still no difference. same codes as above plus misfire on 3 and 4.

 

New o2 sensor
Total number of fault codes: 5

P0170 - Lean Exhaust
(02) - Not present

P0304 - Cylinder 4 Misfire Detected
(01) - Not present

P0302 - Cylinder 2 Misfire Detected
(01) - Not present

P0135 - O2 Sensor Heater Circuit Open (Bank 1 Sensor 1)
(04) - Present

P0130 - O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
(01) - Present

Old o2 sensor
Total number of fault codes: 3

P0303 - <Unknown DTC>
(04) - Not present

P0170 - Lean Exhaust
(02) - Present

P0304 - <Unknown DTC>
(04) - Present

 

I'm having similar bother on my 60plate 1.7 diesel
Had fuel pump, new rail etc and still there.
I cleaned up part of the manifold intake pipe and it has softened the surging a bit but still there.

Could be worth checking a bit deeper for restriction in system?

 

I think the bother has been 99% resolved on mine and it just needs a full fuel system flush as it's down to muck in the system.
Didn't need to replace anything.

Maybe clean out the egr, .throttle and 1st section of the inlet manifold (corner bit under inspection cover) it massively improves air flow

System additives & cleaners don't actually work as just loosen up old rubbish but still a problem.
Get a proper garage clean done including tank (had a terraclean done when I first got car and didn't help)