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[maker]

Hi - I have a 2002 2.2i petrol Omega. Emission warning light came on and garage diagnosed mis-firing cyclinder 4 and replaced HT lead. Light came on again and fault code indicated low voltage on mass air sensor which was replaced. Now warning light of car with spanner comes on 5 mins after starting, and car idles unevenly. After driving 3 miles and immediatly restarting warning light goes away for another 5 mins driving.
Fault codes are below which did not come up when earlier repairs done. I am reluctant to pay garage to replace parts if they are not underlying problem. Anyone seen this before and know underlying problemie.e these fault codes and intermittent uneven idle?

Total number of fault codes: 3

P0136 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
 (02) - Not present

P1555 - Throttle Position Sensor (TPS) Load Signal not Plausible with Engine Load
 (00) - Not present

P0130 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
 (02) - Not present

[feeutfo]

0130 0136 show as circuit malfunction on the list I have.

2.2 has no plug leads, but a coil PAC. Does it not?

[maker]

I don't understand muchabout my Omega ot be honest. The garage said something about a coil but noticed a split in a lead and thought it was shorting out.
On the circuit malfuntion any ideas what would cause that?

[feeutfo]

Oh ok, maybe we're talking about one of the rubber boots on the coil pack...?

The boots are available separately from the dealers if that helps.

If there's no visible wiring fault to lambda sensor, suggest a live data capable code reader to look at lambda activity once emgine up to temp.

If you put a rough location in your profile, we might be able to direct you to a tech 2 if in the uk...?

See what others say though. Not as familiar with lambdas as I'd like.

[maker]

I some "My Naff Code Reader" software which does live readings so I can see mV readings if that helps. Don't know what a good or bad reading is though. Is there any guidance on what is good?