Instead of spending hours trying to figure out how to fix this I decided to ask my brick board experts :-) 1993 Volvo 240 wagon. Son in law was learning to drive our car. It's been sitting getting a clutch put in for a couple years (neck injury so long process ) and has had other parts replaced and swapped out with our other 93 wagon. Was running like its old 330 thousand mile self when the check engine light came on. He is getting an error code 2-2-1 and says there are no other error codes. We did recently swap out an idle air control valve as the other wagon had one go bad. But not sure that would be the problem. Error code 2-2-1 new clutch driving son in law so car probably has been going through the shakes of that. Ideas of where we should start?

Hi muggy,

You have OBD socket 2 (fuel injection) code 2-2-1.

The code meaning is here:
https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm

See "Table 1: Bosch LH2.4 and Motronic ..." Ignore the Motronic entries

Did you repeat the procedure to see if any other fault codes display?

Did you check OBD socket code 6?

At essence, such a fault code may indicate fault with the oxygen sensor. Or an air intake leaks at any point between the air filter box to the air intake manifold gasket.

You may have an exhaust leak, also. At any point from the exhaust manifold to cylinder head gasket to the three bolt spin gasket between the header pipe pipe out put to the catalytic converter input.

At the end of the header pipe should be a bracket connection, secured at the two right most (as you sit in the car) bell housing to engine block bolts. There is an L-shaped bracket between that secures to the end of the header pipe and this secured to the bellhousing bolts steel bracket. Without this union, heavy exhaust system will sway and can cuase elaks at the header pipe output to catalytic converter input union.

Exhaust leaks after the catalytic converter may also cause problems, though far less likely.

Yet with the mix of parts and clutch replacement work, stating exactly the cause is a little difficult.

If you have a digital multimeter, you can test the oxygen sensor output to assess it works well (enough) or not. The single large heavy wire is the positive and touch the digital multimeter negative lead to a good ground. The digital multimeter should display around .1 to .9 volts DC and wildly so.

Else, others will offer good ideas for you so you can diagnose and solve the problem.

Questions?

Hope that helps.
--
Give your brickboard.com a big thumbs up! Way up! - Roger Ebert.