95 940 turbo will not pass emissions 2-3-1 trouble code?
95 940 turbo will not pass emissions 2-3-1 trouble code?
for the first time in 14 years the car will not pass emissions. it still runs like a new one but the 2-3-1 code reoccurs after i clear it. i always check/clean/change or do everything that would affect the emissions test before i go for it. do i need a new oxygen sensor since this code is saying something about it? what about the cat convertor? the check engine light has never come on. bill addressed the code issue when i had a slight hesitation at start off and clearing the code temporarily solved the accel issue which, of course, may not be related to the emissions issue.
- billofdurham
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- Joined: 2 February 2006
- Year and Model: 855, 1995
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Unfortunately 2-3-1 only covers fuel trim and is not specific about whether the trim is lean or rich.
Some of the checks to be done, according to VADIS, are:
Lean trim - Air leakage
Low fuel pressure
Faulty sensor signals
Rich trim - High fuel pressure
Contaminated engine oil (fuel)
Leaking injector
Leaking canister purge valve
Faulty sensor signals
Leaking exhaust sytem
Another reference I have, which will remain unnamed, also calls for checks on:
Heated oxygen sensor
MAF sensor
ECT sensor (not the one for the gauge)
This is for both lean and rich trim.
Bill.
Some of the checks to be done, according to VADIS, are:
Lean trim - Air leakage
Low fuel pressure
Faulty sensor signals
Rich trim - High fuel pressure
Contaminated engine oil (fuel)
Leaking injector
Leaking canister purge valve
Faulty sensor signals
Leaking exhaust sytem
Another reference I have, which will remain unnamed, also calls for checks on:
Heated oxygen sensor
MAF sensor
ECT sensor (not the one for the gauge)
This is for both lean and rich trim.
Bill.
Work was good - retirement is better.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
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